libstdc++: Extend max_align_t special case to 64-bit HP-UX [PR77691]

libstdc++: Extend max_align_t special case to 64-bit HP-UX [PR77691]

GCC's std::max_align_t doesn't agree with the system malloc on HP-UX, so
generalize the current hack for Solaris to apply to that target too.

libstdc++-v3/ChangeLog:

	PR libstdc++/77691
	* include/experimental/memory_resource
	(_GLIBCXX_MAX_ALIGN_MATCHES_MALLOC): Define.
	(do_allocate, do_deallocate): Check it.
	* testsuite/experimental/memory_resource/new_delete_resource.cc:
	Relax expected behaviour for 64-bit hppa-hp-hpux11.11.