Revert move of g++.dg/pr69667.C

Revert move of g++.dg/pr69667.C

Commit eccbd7fcee5bbfc47731e8de83c44eee2e3dcc4b moved the subject file to
g++.target/powerpc.  Unfortunately, test g++.dg/tsan/pr88018.C includes
"../pr69667.C".

Revert the move of this file.

Commit 14e678a2c4a76433fd4029568d28530c921e11ee relaxed some DejaGnu
directives in g++.dg/tsan/pr88018.C, given its more restrictive environment
within g++.target/powerpc.  Revert these changes in that file as well.

2022-05-18  Paul A. Clarke  <pc@us.ibm.com>

gcc/testsuite
	PR target/105620
	* g++.target/powerpc/pr69667.C: Move to ...
	* g++.dg/pr69667.C: here. Also, revert recent dg directives changes.