Make bn2dec work on "SIXTY_FOUR_BIT" platforms.

PR: 1456

crypto/bio/b_print.c

@@ -79,7 +79,7 @@
 #include <openssl/bn.h>         /* To get BN_LLONG properly defined */
 #include <openssl/bio.h>
 
-#ifdef BN_LLONG
+#if defined(BN_LLONG) || defined(SIXTY_FOUR_BIT)
 # ifndef HAVE_LONG_LONG
 #  define HAVE_LONG_LONG 1
 # endif
@@ -116,8 +116,8 @@
 #endif
 
 #ifdef HAVE_LONG_LONG
-# if defined(OPENSSL_SYS_WIN32) && !defined(__GNUC__)
-# define LLONG _int64
+# if defined(_WIN32) && !defined(__GNUC__)
+# define LLONG __int64
 # else
 # define LLONG long long
 # endif