'{c-c++-common,gfortran.dg}/gomp/uses_allocators-*' -> 'libgomp.{c-c++-common,fortran...

'{c-c++-common,gfortran.dg}/gomp/uses_allocators-*' -> 'libgomp.{c-c++-common,fortran}/uses_allocators-*'

Otherwise, for build-tree testing:

    [...]/gcc/testsuite/c-c++-common/gomp/uses_allocators-1.c:4:10: fatal error: omp.h: No such file or directory

    [...]/gcc/testsuite/c-c++-common/gomp/uses_allocators-2.c:3:10: fatal error: omp.h: No such file or directory

    [...]/gcc/testsuite/c-c++-common/gomp/uses_allocators-3.c:4:10: fatal error: omp.h: No such file or directory

    [...]/gcc/testsuite/gfortran.dg/gomp/uses_allocators-1.f90:5:7: Fatal Error: Cannot open module file 'omp_lib.mod' for reading at (1): No such file or directory

    [...]/gcc/testsuite/gfortran.dg/gomp/uses_allocators-2.f90:4:7: Fatal Error: Cannot open module file 'omp_lib.mod' for reading at (1): No such file or directory

    [...]/gcc/testsuite/gfortran.dg/gomp/uses_allocators-3.f90:4:7: Fatal Error: Cannot open module file 'omp_lib.mod' for reading at (1): No such file or directory

..., and thus corresponding FAILs, UNRESOLVEDs.

Fix-up for og12 commit dbc770c4351c8824e8083f8aff6117a6b4ba3c0d
"openmp: Implement uses_allocators clause".

	gcc/testsuite/
	* c-c++-common/gomp/uses_allocators-1.c: Cut.
	* c-c++-common/gomp/uses_allocators-2.c: Likewise.
	* c-c++-common/gomp/uses_allocators-3.c: Likewise.
	* gfortran.dg/gomp/uses_allocators-1.f90: Likewise.
	* gfortran.dg/gomp/uses_allocators-2.f90: Likewise.
	* gfortran.dg/gomp/uses_allocators-3.f90: Likewise.
	libgomp/
	* testsuite/libgomp.c++/c++.exp (check_effective_target_c)
	(check_effective_target_c++): New.
	* testsuite/libgomp.c/c.exp (check_effective_target_c)
	(check_effective_target_c++): Likewise.
	* testsuite/libgomp.c-c++-common/uses_allocators-1.c: Paste.
	* testsuite/libgomp.c-c++-common/uses_allocators-2.c: Likewise.
	* testsuite/libgomp.c-c++-common/uses_allocators-3.c: Likewise.
	* testsuite/libgomp.fortran/uses_allocators-1.f90: Likewise.
	* testsuite/libgomp.fortran/uses_allocators-2.f90: Likewise.
	* testsuite/libgomp.fortran/uses_allocators-3.f90: Likewise.