SDL builds are unable to guarentee stdin works, so don't depend on it (eg: when setrenderer fails completely due to no display server).

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@6125 fc73d0e0-1445-4013-8a0c-d673dee63da5

engine/client/sys_sdl.c

@@ -786,7 +786,7 @@ int VARGS Sys_DebugLog(char *file, char *fmt, ...)
 
 qboolean Sys_InitTerminal(void)
 {
-	return true;
+    return false;	//Sys_ConsoleInput cannot work, so return false here.
 }
 char *Sys_ConsoleInput(void)
 {