[binutils-gdb] Move utils-selftests.c -> gdb/unittests/

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT b2f8eb7a30dcf7c33ea26dfca31401a6786dcd99 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: b2f8eb7a30dcf7c33ea26dfca31401a6786dcd99

Move utils-selftests.c -> gdb/unittests/

This file was only under gdb/ currently because it predates the
gdb/unittests/ directory.

gdb/ChangeLog:
2017-09-28  Pedro Alves  <palves@redhat.com>

	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
	unittests/common-utils-selftests.c.
	(SUBDIR_UNITTESTS_OBS): Add common-utils-selftests.o.
	(COMMON_OBS): Remove utils-selftests.o.
	* utils-selftests.c: Move to ...
	* unittests/common-utils-selftests.c: ... here and rename self
	test to "string_printf".