Added cast macros so SDL_net will compile with SDL 1.2

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%403880

include/SDL_stdinc.h

@@ -78,6 +78,16 @@
 #define SDL_arraysize(array)	(sizeof(array)/sizeof(array[0]))
 #define SDL_TABLESIZE(table)	SDL_arraysize(table)
 
+/* Use proper C++ casts when compiled as C++ to be compatible with the option
+ -Wold-style-cast of GCC (and -Werror=old-style-cast in GCC 4.2 and above. */
+#ifdef __cplusplus
+#define SDL_reinterpret_cast(type, expression) reinterpret_cast<type>(expression)
+#define SDL_static_cast(type, expression) static_cast<type>(expression)
+#else
+#define SDL_reinterpret_cast(type, expression) ((type)(expression))
+#define SDL_static_cast(type, expression) ((type)(expression))
+#endif
+
 /** @name Basic data types */
 /*@{*/
 typedef enum SDL_bool {