Backport fixes for BZ #15006 from master.

Resolved backport request BZ #15122.

Assume all unmarked objects are compatible with all ABI variants.
Such objects may have been generated in a transitional period when
ABI tags were not added to all objects.

---

2013-02-08  Carlos O'Donell  <carlos@redhat.com>

	[BZ #15006]
	* sysdeps/generic/ldconfig.h: Define FLAG_ARM_LIBSF.
	* elf/cache.c (print_entry): Add FLAG_ARM_LIBSF support.

ports/

2013-02-08  Carlos O'Donell  <carlos@redhat.com>

	[BZ #15006]
	* sysdeps/unix/sysv/linux/arm/dl-cache.h
	[__ARM_PCS_VFP] (_dl_cache_check_flags): Allow plain FLAG_ELF_LIBC6.
	[!__ARM_PCS_VFP] (_dl_cache_check_flags): Likewise.
	* sysdeps/unix/sysv/linux/arm/readelflib.c (process_elf_file):
	Set FLAG_ARM_LIBSF for soft-float ABI otherwise just FLAG_ELF_LIBC6.