MEM: Increase default mem size to 256MB.

Stop gap fix for QW-Group#665. Could include some detection of memory to avoid
allocating 256MB if system is puny. Ideal solution would be dynamic
allocation. This at least allows modern maps to load.

sys_posix.c

@@ -335,7 +335,7 @@ int main(int argc, char **argv)
 	if (COM_CheckParm(cmdline_param_client_nostdoutput))
 		sys_nostdout.value = 1;
 
-	Host_Init (argc, argv, 128 * 1024 * 1024);
+	Host_Init (argc, argv, 256 * 1024 * 1024);
 
 	oldtime = Sys_DoubleTime ();
 	while (1) {

sys_win.c

@@ -61,7 +61,7 @@ __attribute__((dllexport)) DWORD AmdPowerXpressRequestHighPerformance = 0x000000
 #endif
 
 #define MINIMUM_WIN_MEMORY	0x0c00000
-#define MAXIMUM_WIN_MEMORY	0x8000000
+#define MAXIMUM_WIN_MEMORY	0xfffffff
 
 #define PAUSE_SLEEP		50				// sleep time on pause or minimization
 #define NOT_FOCUS_SLEEP	20				// sleep time when not focus