libgomp.fortran/metadirective-1.f90: Expect 'error:' for nvptx compile [PR118694]

libgomp.fortran/metadirective-1.f90: Expect 'error:' for nvptx compile [PR118694]

This should have been part of commit r16-838-gb3d07ec7ac2ccd or
r16-883-g5d6ed6d604ff94 - all showing the same issue:
'!$omp target' followed by a metadirective with 'teams'; if
the metadirective cannot be early resolved, a diagnostic
error is shown about using directives between 'target' and
'teams'.

While the message is misleading, the problem is that the
host invokes 'target' differently when 'teams' is present;
in this case, host fallback + amdgcn offload require the
no-teams case, nvptx offload the teams case such that it
only can be resolved at runtime.

Mark the error as 'dg-bogus + xfail' to silence the FAIL,
when nvptx offloading is compiled for. (If not, the
metadirective can be resolved early during compilation.)

libgomp/ChangeLog:

	PR middle-end/118694
	* testsuite/libgomp.fortran/metadirective-1.f90: xfail when
	compiling (also) for nvptx offloading as an error is then expected.

(cherry picked from commit 5b2e7afb135aa10e17e51b891d4b2c85ee541ade)