Fix typo (#162)

thanks for the PR of the typo :)

Author: Crayon2000

gc/gctypes.h

@@ -62,7 +62,7 @@ typedef volatile double vf64;
 /*+----------------------------------------------------------------------------------------------+*/
 #ifndef BIG_ENDIAN
 #define BIG_ENDIAN     1234
-#endif /* BIGE_ENDIAN */
+#endif /* BIG_ENDIAN */
 /*+----------------------------------------------------------------------------------------------+*/
 #ifndef BYTE_ORDER
 #define BYTE_ORDER     BIG_ENDIAN