Revert "[nvptx, libgomp] Update pr85381-{2,4}.c test-cases" [PR89713, PR94392]

Revert "[nvptx, libgomp] Update pr85381-{2,4}.c test-cases" [PR89713, PR94392]

In response to PR94392 commit 75efe9cb1f8938a713ce540dc3b27bc2afcd3fae
"c/94392 - only enable -ffinite-loops for C++", this reverts PR89713
commit 00908992f2a78f213d227aea8dbab014a1361df0, as apparently now again
"empty oacc loops are" no longer "removed before expand".

	libgomp/
	PR tree-optimization/89713
	PR c/94392
	* testsuite/libgomp.oacc-c-c++-common/pr85381-2.c: Again expect
	'bar.sync'.
	* testsuite/libgomp.oacc-c-c++-common/pr85381-4.c: Likewise.