Move gfortran.dg/gomp/declare-variant-mod-1*.f90 to libgomp.fortran/ [PR115271]

The test is a supposed to be a compile-only test but as dg-additional-sources
does not work with dg-compile (due to compiling with '-o'), dg-link had to
be used; as the code actually compiles (no diagnostic error), the linker
is actually invoked, which fails unless the system compiler by chance
provides the required files. Solution: move the test to libgomp.

	PR fortran/115271

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/declare-variant-mod-1-use.f90: Move to
	libgomp/testsuite/libgomp.fortran/.
	* gfortran.dg/gomp/declare-variant-mod-1.f90: Likewise.

libgomp/ChangeLog:

	* testsuite/libgomp.fortran/declare-variant-mod-1-use.f90: Moved
	from gcc/testsuite/gfortran.dg/gomp/.
	* testsuite/libgomp.fortran/declare-variant-mod-1.f90: Likewise.

diff --git a/gcc/testsuite/gfortran.dg/gomp/declare-variant-mod-1-use.f90 b/libgomp/testsuite/libgomp.fortran/declare-variant-mod-1-use.f90
similarity index 100%
rename from gcc/testsuite/gfortran.dg/gomp/declare-variant-mod-1-use.f90
rename to libgomp/testsuite/libgomp.fortran/declare-variant-mod-1-use.f90

diff --git a/gcc/testsuite/gfortran.dg/gomp/declare-variant-mod-1.f90 b/libgomp/testsuite/libgomp.fortran/declare-variant-mod-1.f90
similarity index 100%
rename from gcc/testsuite/gfortran.dg/gomp/declare-variant-mod-1.f90
rename to libgomp/testsuite/libgomp.fortran/declare-variant-mod-1.f90