gdcache: fix main function error

First argument of ‘main’ should be ‘int’.

src/gdcache.c

@@ -199,7 +199,7 @@ static void cacheRelease(void *map)
 	gdFree((char *)map);
 }
 
-int main(char *argv[], int argc)
+int main(int argc, char **argv)
 {
 	gdCache_head_t *cacheTable;
 	int elem, key;