Failures on Fedora-ppc64be-native-extended-gdbserver-m64, branch master

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	fedora-ppc64be-1

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Fedora-ppc64be-native-extended-gdbserver-m64/builds/4846>

Commit(s) tested:
	d1b3de2e43380a0c51772a40315cd2268573d985

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

Subject:
	Use gdbpy_ref in gdbpy_string_to_argv

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Fedora-ppc64be-native-extended-gdbserver-m64/d1/d1b3de2e43380a0c51772a40315cd2268573d985/>