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/7239>

Commit(s) tested:
	122b53ea6a99c8811fb9cb84869b949b1ac55b22

Author(s) (in the same order as the commits):
	Tom Tromey <tom@tromey.com>

Subject:
	Remove output_command_const

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/RHEL-s390x-m64/12/122b53ea6a99c8811fb9cb84869b949b1ac55b22/>