Don’t use the recvmmsg dgram method on Android <5

recvmmsg and sendmmsg were only added to Android’s C library in version 5, starting with API Level 21.

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23754)

crypto/bio/bss_dgram.c

@@ -66,6 +66,10 @@
    #undef NO_RECVMSG
    #define NO_RECVMSG
 # endif
+# if defined(__ANDROID_API__) && __ANDROID_API__ < 21
+#  undef NO_RECVMMSG
+#  define NO_RECVMMSG
+# endif
 # if !defined(M_METHOD)
 #  if defined(OPENSSL_SYS_WINDOWS) && defined(BIO_HAVE_WSAMSG) && !defined(NO_WSARECVMSG)
 #   define M_METHOD  M_METHOD_WSARECVMSG