Missing pr104517.c change from: 'Add a restriction on allocate clause (OpenMP 5.0)'

Missing pr104517.c change from: 'Add a restriction on allocate clause (OpenMP 5.0)'

OG12 commit df47c25110474565f521508a1545232550052a75 included everything
of r13-150-g1a8c4d9ed36556a95bd7d53c04d2ec4c95594061 but the change to
gcc/testsuite/gcc.dg/gomp/pr104517.c

This commit cherry-picks the missing changes to that file.
Note: The OG12 commit already contained the ChangeLog.omp entry for
that file.

gcc/testsuite/
	* gcc.dg/gomp/pr104517.c: Update.

(cherry picked from commit 1a8c4d9ed36556a95bd7d53c04d2ec4c95594061)