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.

sv_sys_win.c

@@ -738,7 +738,7 @@ int main(int ac, char *av[])
 
 	GetConsoleTitle(title, sizeof(title));
 
-	Host_Init(argc, argv, DEFAULT_MEM_SIZE);
+	Host_Init(argc, argv, 256 * 1024 * 1024);
 
 	// run one frame immediately for first heartbeat
 	SV_Frame (0.1);

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) {