[PATCH]: Fix PR bootstrap/29402 parallel make bug

[DJ Delorie]

> Okay for mainline?

Ok.

> 2006-10-12  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
> 
> 	PR bootstrap/29402
> 	* Makefile.in (ALL_GTFILES_H): Use $(sort ...) instead of
> 	shell pipeline.