* Fix warning in cl_main.c

* Fix bug #4026 (SDL dx backend doesn't work on some machines)

code/sys/sys_unix.c

@@ -516,6 +516,18 @@ void Sys_ErrorDialog( const char *error )
 	FS_FCloseFile( f );
 }
 
+/*
+==============
+Sys_GLimpSafeInit
+
+Unix specific "safe" GL implementation initialisation
+==============
+*/
+void Sys_GLimpSafeInit( void )
+{
+	// NOP
+}
+
 /*
 ==============
 Sys_GLimpInit