Fix checks for Cygwin-related macros.

The search-and-replace done in commit 0466160 broke compilation on Cygwin.

Closes #198 on GitHub.

src/getopt.c

@@ -83,7 +83,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #endif
 #endif
 
-#if defined (WIN32) && !defined (__CYGWIN32__32)
+#if defined (WIN32) && !defined (__CYGWIN32__)
 /* It's not Unix, really.  See?  Capital letters.  */
 #include <windows.h>
 #define getpid() GetCurrentProcessId()

src/net_setup.c

@@ -239,7 +239,7 @@ static bool read_rsa_private_key(void) {
 		return false;
 	}
 
-#if !defined(HAVE_MINGW) && !defined(HAVE___CYGWIN32__)
+#if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 	struct stat s;
 
 	if(!fstat(fileno(fp), &s)) {
@@ -860,7 +860,7 @@ static bool setup_myself(void) {
 #ifdef HAVE_MINGW
 	Sleep(1000);
 #endif
-#ifdef HAVE___CYGWIN32__
+#ifdef HAVE_CYGWIN
 	sleep(1);
 #endif
 	execute_script("tinc-up", envp);

src/utils.c

@@ -54,8 +54,8 @@ void bin2hex(char *src, char *dst, int length) {
 	}
 }
 
-#if defined(HAVE_MINGW) || defined(HAVE___CYGWIN32__)
-#ifdef HAVE___CYGWIN32__
+#if defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
+#ifdef HAVE_CYGWIN
 #include <w32api/windows.h>
 #endif
 

src/utils.h

@@ -24,8 +24,11 @@
 extern bool hex2bin(char *src, char *dst, int length);
 extern void bin2hex(char *src, char *dst, int length);
 
-#ifdef HAVE_MINGW
+#if defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
 extern const char *winerror(int);
+#endif
+
+#ifdef HAVE_MINGW
 #define strerror(x) ((x)>0?strerror(x):winerror(GetLastError()))
 #define sockerrno WSAGetLastError()
 #define sockstrerror(x) winerror(x)