Optimize CAST for size on 64-bit platforms. For reference, CAST_LONG being

unsigned long must be attributed to 16-bit support. As we don't support
16-bit platoforms anymore, there is no reason to waste twice required
space on CAST S-boxes (16KB vs. 8KB) or key schedule.

crypto/cast/cast.h

@@ -72,7 +72,7 @@ extern "C" {
 #define CAST_ENCRYPT	1
 #define CAST_DECRYPT	0
 
-#define CAST_LONG unsigned long
+#define CAST_LONG unsigned int
 
 #define CAST_BLOCK	8
 #define CAST_KEY_LENGTH	16