openssl: don't define SIXTY_FOUR_BIT_LONG on Windows

On Windows a long integer is always 32-bits, even when the target
architecture uses 64-bit pointers.

PR-URL: nodejs#124
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: piscisaureus

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(_LP64)
 #   define SIXTY_FOUR_BIT_LONG
 #  else
 #   define SIXTY_FOUR_BIT