xfail gnat.dg/trampoline3.adb scan-assembler-not check on hppa*-*-*

We still require an executable stack for trampolines on hppa*-*-*.

2024-02-01  John David Anglin  <danglin@gcc.gnu.org>

gcc/testsuite/ChangeLog:

	* gnat.dg/trampoline3.adb: xfail scan-assembler-not
	check on hppa*-*-*.