Failures on RHEL-s390x-m64, branch master

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	rhel-7_1-s390x-1

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/RHEL-s390x-m64/builds/7288>

Commit(s) tested:
	da05d921f0b7b9f9f07ac4e78ee228e7ecf847e0

Author(s) (in the same order as the commits):
	Pedro Alves <palves@redhat.com>

Subject:
	Fix macOS build, missing override

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/RHEL-s390x-m64/da/da05d921f0b7b9f9f07ac4e78ee228e7ecf847e0/>