libcc1: Clean compiler-name.h (PR70173)

libcc1: Clean compiler-name.h (PR70173)

Since the file is generated from a Makefile fragment, it needs to be
added to MOSTLYCLEANFILES.  The directory itself is still not deleted
(just like the gnattools and gotools directories).

2016-04-11  Segher Boessenkool  <segher@kernel.crashing.org>

libcc1/
	PR bootstrap/70173
	* Makefile.am (MOSTLYCLEANFILES): New, add compiler-name.h .
	(compiler-name.h): Shorten recipe so that it fits the line.
	* Makefile.in: Regenerate.

From-SVN: r234874