Add a testcase for PR binutils/14567

Add a testcase for PR binutils/14567

binutils/

	PR binutils/14567
	* Makefile.am (BFDTEST2_PROG): New.
	(bfdtest2_DEPENDENCIES): Likewise.
	(TEST_PROGS): Add $(BFDTEST2_PROG).
	* Makefile.in: Regenerated.
	* bfdtest2.c: New file.

binutils/testsuite/

	PR binutils/14567
	* binutils-all/ar.exp (bfdtest1): Removed.
	(long_filenames): Take bfdtests.
	(thin_archive): Likewise.
	(thin_archive_with_nested): Likewise.
	(bfdtests): New.
	Pass $bfdtests to long_filenames, thin_archive and
	thin_archive_with_nested.