testsuite: xfail scan-assembler-times in c-c++-common/gomp/unroll-[45].c

Count differs on hppa*-*-hpux* due to hpux specific directives.

2024-12-15  John David Anglin  <danglin@gcc.gnu.org>

gcc/testsuite/ChangeLog:

	* c-c++-common/gomp/unroll-4.c: xfail scan-assembler-times
	"dummy" for hppa*-*-hpux*.
	* c-c++-common/gomp/unroll-5.c: Likewise.