[PR92116, PR92877] [OpenACC] Replace 'openacc.data_environ' by standard libgomp mechanics

[PR92116, PR92877] [OpenACC] Replace 'openacc.data_environ' by standard libgomp mechanics

	libgomp/
	PR libgomp/92116
	PR libgomp/92877
	* oacc-mem.c (lookup_dev): Reimplement.  Adjust all users.
	* libgomp.h (struct acc_dispatch_t): Remove 'data_environ' member.
	Adjust all users.
	* testsuite/libgomp.oacc-c-c++-common/acc_free-pr92503-4-2.c:
	Remove XFAIL.
	* testsuite/libgomp.oacc-c-c++-common/acc_free-pr92503-4.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/pr92877-1.c: New file.

Co-Authored-By: Julian Brown <julian@codesourcery.com>
From-SVN: r279147