openssl: don't define SIXTY_FOUR_BIT_LONG on Windows

On Windows (and potentially other LP64 platforms), a long integer is
always 32-bits, even when the target architecture uses 64-bit pointers.

Signed-off-by: Bert Belder <bertbelder@gmail.com>

deps/openssl/config/opensslconf.h

@@ -221,7 +221,7 @@
 # undef SIXTEEN_BIT
 # undef EIGHT_BIT
 # if defined(_M_X64) || defined(__x86_64__)
-#  if defined(_WIN64) || defined(_LP64)
+#  if !defined(_WIN32) && !defined(_LP64)
 #   define SIXTY_FOUR_BIT_LONG
 #  else
 #   define SIXTY_FOUR_BIT