Various Win32 related fixed. Make no-krb5 work in mkdef.pl .

Fix warning in apps/engine.c

Remove definitions of deleted functions.

Add missing definition of X509_VAL.

apps/engine.c

@@ -99,7 +99,7 @@ static int append_buf(char **buf, char *s, int *size, int step)
 	if (**buf != '\0')
 		l += 2;		/* ", " */
 
-	if (strlen(*buf) + strlen(s) >= *size)
+	if (strlen(*buf) + strlen(s) >= (unsigned int)*size)
 		{
 		*size += step;
 		*buf = OPENSSL_realloc(*buf, *size);