sub-make quoted flags fix for non-symlink capable hosts

[Mark E.]

> Hi guys,
> This patch allows DJGPP and probably other hosts that don't support symlinks to properly quote the arguments to sub-makes. Tested with DJGPP, but I couldn't finish a bootstrap because of an internal 
> compiler error when building the g++ compiler. But at least I got far enough to verify the fix works.

Laurynas reports that the patch doesn't work for him because of an extra 
'../'. When it build "manually" instead of using a script, the change does do 
this.

I withdraw this patch until I can figure out what's going on.