PR bootstrap/52840: libstdc++: let debug find sources for compatibility.lo

2012-04-05  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

	PR bootstrap/52840
	* src/Makefile.am (build-debug): Do not adjust vpath dir, remove
	Makefile.tmp
	* src/Makefile.in: Adjust as per above.

From-SVN: r186156