build: drop unused/redundant `HAVE_WINLDAP_H`

Sources did not use it. Autotools used it when checking for the
`winldap` library, which is redundant.

With CMake, detection was broken:
```
Run Build Command(s):/usr/local/Cellar/cmake/3.26.3/bin/cmake -E env VERBOSE=1 /usr/bin/make -f Makefile cmTC_2d8fe/fast && /Library/Developer/CommandLineTools/usr/bin/make  -f CMakeFiles/cmTC_2d8fe.dir/build.make CMakeFiles/cmTC_2d8fe.dir/build
Building C object CMakeFiles/cmTC_2d8fe.dir/HAVE_WINLDAP_H.c.obj
/usr/local/opt/llvm/bin/clang --target=x86_64-w64-mingw32 --sysroot=/usr/local/opt/mingw-w64/toolchain-x86_64 -D_WINSOCKAPI_="" -I/my/quictls/x64-ucrt/usr/include -I/my/zlib/x64-ucrt/usr/include -I/my/brotli/x64-ucrt/usr/include -Wno-unused-command-line-argument   -D_UCRT -DCURL_HIDDEN_SYMBOLS -DHAVE_SSL_SET0_WBIO -DHAS_ALPN -DNGHTTP2_STATICLIB -DNGHTTP3_STATICLIB -DNGTCP2_STATICLIB -DUSE_MANUAL=1  -fuse-ld=lld -Wl,-s -static-libgcc  -lucrt  -Wextra -Wall -pedantic -Wbad-function-cast -Wconversion -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wno-long-long -Wno-multichar -Wpointer-arith -Wshadow -Wsign-compare -Wundef -Wunused -Wwrite-strings -Wcast-align -Wdeclaration-after-statement -Wempty-body -Wendif-labels -Wfloat-equal -Wignored-qualifiers -Wno-format-nonliteral -Wno-sign-conversion -Wno-system-headers -Wstrict-prototypes -Wtype-limits -Wvla -Wshift-sign-overflow -Wshorten-64-to-32 -Wdouble-promotion -Wenum-conversion -Wunused-const-variable -Wcomma -Wmissing-variable-declarations -Wassign-enum -Wextra-semi-stmt  -MD -MT CMakeFiles/cmTC_2d8fe.dir/HAVE_WINLDAP_H.c.obj -MF CMakeFiles/cmTC_2d8fe.dir/HAVE_WINLDAP_H.c.obj.d -o CMakeFiles/cmTC_2d8fe.dir/HAVE_WINLDAP_H.c.obj -c /my/curl/bld-cmake-llvm-x64-shared/CMakeFiles/CMakeScratch/TryCompile-3JP6dR/HAVE_WINLDAP_H.c
In file included from /my/curl/bld-cmake-llvm-x64-shared/CMakeFiles/CMakeScratch/TryCompile-3JP6dR/HAVE_WINLDAP_H.c:2:
In file included from /usr/local/opt/mingw-w64/toolchain-x86_64/x86_64-w64-mingw32/include/winldap.h:17:
In file included from /usr/local/opt/mingw-w64/toolchain-x86_64/x86_64-w64-mingw32/include/schnlsp.h:9:
In file included from /usr/local/opt/mingw-w64/toolchain-x86_64/x86_64-w64-mingw32/include/schannel.h:10:
/usr/local/opt/mingw-w64/toolchain-x86_64/x86_64-w64-mingw32/include/wincrypt.h:5041:254: error: unknown type name 'PSYSTEMTIME'
  WINIMPM PCCERT_CONTEXT WINAPI CertCreateSelfSignCertificate (HCRYPTPROV_OR_NCRYPT_KEY_HANDLE hCryptProvOrNCryptKey, PCERT_NAME_BLOB pSubjectIssuerBlob, DWORD dwFlags, PCRYPT_KEY_PROV_INFO pKeyProvInfo, PCRYPT_ALGORITHM_IDENTIFIER pSignatureAlgorithm, PSYSTEMTIME pStartTime, PSYSTEMTIME pEndTime, PCERT_EXTENSIONS pExtensions);
                                                                                                                                                                                                                                                             ^
/usr/local/opt/mingw-w64/toolchain-x86_64/x86_64-w64-mingw32/include/wincrypt.h:5041:278: error: unknown type name 'PSYSTEMTIME'
  WINIMPM PCCERT_CONTEXT WINAPI CertCreateSelfSignCertificate (HCRYPTPROV_OR_NCRYPT_KEY_HANDLE hCryptProvOrNCryptKey, PCERT_NAME_BLOB pSubjectIssuerBlob, DWORD dwFlags, PCRYPT_KEY_PROV_INFO pKeyProvInfo, PCRYPT_ALGORITHM_IDENTIFIER pSignatureAlgorithm, PSYSTEMTIME pStartTime, PSYSTEMTIME pEndTime, PCERT_EXTENSIONS pExtensions);
                                                                                                                                                                                                                                                                                     ^
2 errors generated.
make[1]: *** [CMakeFiles/cmTC_2d8fe.dir/HAVE_WINLDAP_H.c.obj] Error 1
make: *** [cmTC_2d8fe/fast] Error 2
exitCode: 2
```

Cherry-picked from #11095 88e4a21ff70ccef391cf99c8165281ff81374503
Reviewed-by: Daniel Stenberg
Closes #11245

CMakeLists.txt

@@ -673,9 +673,7 @@ if(NOT CURL_DISABLE_LDAP)
   endif()
 
   # Now that we know, we're not using windows LDAP...
-  if(USE_WIN32_LDAP)
-    check_include_file_concat("winldap.h" HAVE_WINLDAP_H)
-  else()
+  if(NOT USE_WIN32_LDAP)
     # Check for LDAP
     set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_LIBRARIES})
     check_library_exists_concat(${CMAKE_LDAP_LIB} ldap_init HAVE_LIBLDAP)

acinclude.m4

@@ -345,46 +345,6 @@ AC_DEFUN([CURL_CHECK_HEADER_WINCRYPT], [
 ])
 
 
-dnl CURL_CHECK_HEADER_WINLDAP
-dnl -------------------------------------------------
-dnl Check for compilable and valid winldap.h header
-
-AC_DEFUN([CURL_CHECK_HEADER_WINLDAP], [
-  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
-  AC_CACHE_CHECK([for winldap.h], [curl_cv_header_winldap_h], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#undef inline
-#ifdef HAVE_WINDOWS_H
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
-#endif
-#include <winldap.h>
-      ]],[[
-#if defined(__CYGWIN__) || defined(__CEGCC__)
-        HAVE_WINLDAP_H shall not be defined.
-#else
-        LDAP *ldp = ldap_init("dummy", LDAP_PORT);
-        ULONG res = ldap_unbind(ldp);
-#endif
-      ]])
-    ],[
-      curl_cv_header_winldap_h="yes"
-    ],[
-      curl_cv_header_winldap_h="no"
-    ])
-  ])
-  case "$curl_cv_header_winldap_h" in
-    yes)
-      AC_DEFINE_UNQUOTED(HAVE_WINLDAP_H, 1,
-        [Define to 1 if you have the winldap.h header file.])
-      ;;
-  esac
-])
-
-
 dnl CURL_CHECK_HEADER_LBER
 dnl -------------------------------------------------
 dnl Check for compilable and valid lber.h header,
@@ -612,9 +572,7 @@ AC_DEFUN([CURL_CHECK_LIBS_WINLDAP], [
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
-#ifdef HAVE_WINLDAP_H
 #include <winldap.h>
-#endif
 #ifdef HAVE_WINBER_H
 #include <winber.h>
 #endif

configure.ac

@@ -681,13 +681,11 @@ case X-"$curl_cv_native_windows" in
     CURL_CHECK_HEADER_WINSOCK2
     CURL_CHECK_HEADER_WS2TCPIP
     CURL_CHECK_HEADER_WINCRYPT
-    CURL_CHECK_HEADER_WINLDAP
     ;;
   *)
     curl_cv_header_winsock2_h="no"
     curl_cv_header_ws2tcpip_h="no"
     curl_cv_header_wincrypt_h="no"
-    curl_cv_header_winldap_h="no"
     ;;
 esac
 CURL_CHECK_WIN32_LARGEFILE

lib/curl_config.h.cmake

@@ -577,9 +577,6 @@
 /* Define to 1 if you have the windows.h header file. */
 #cmakedefine HAVE_WINDOWS_H 1
 
-/* Define to 1 if you have the winldap.h header file. */
-#cmakedefine HAVE_WINLDAP_H 1
-
 /* Define to 1 if you have the winsock2.h header file. */
 #cmakedefine HAVE_WINSOCK2_H 1