libapps + libcrypto: Silence warnings on Win64 builds

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27806)

ms/uplink.c

@@ -20,6 +20,7 @@
 #include <windows.h>
 #include <tchar.h>
 #include <stdio.h>
+#include <stddef.h>
 #include "uplink.h"
 void OPENSSL_showfatal(const char *, ...);
 
@@ -89,7 +90,7 @@ void OPENSSL_Uplink(volatile void **table, int index)
         } else
             p = applinktable;
 
-        if (index > (int)p[0])
+        if (index > (intptr_t)p[0])
             break;
 
         if (p[index])