* testsuite_flags.in (PCHFLAGS): Find PCH in new home.

	* testsuite_flags.in (PCHFLAGS): Find PCH in new home.
	* include/Makefile.am (pch_input): Find in ${target_builddir}.
	(pch_output): Rename to...
	(pch_output_builddir): ..this.  Find in ${target_builddir}.
	(pch_source): Tweak.
	(pch_build): Key off a built file.
	(pch_output rule): Rename to...
	(pch_input rule): ...this.  Produce ${pch_output_builddir}
	instead of ${pch_output}.
	(install-pch rule): Install ${pch_output_builddir}.
	* include/Makefile.in: Regenerated.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@65767 138bc75d-0d04-0410-961f-82ee72b054a4