regex: merge patches from libc

2013-02-26  Siddhesh Poyarekar  <siddhesh@redhat.com>
* lib/regex_internal.h (__attribute__): Rename from __attribute.
All uses changed.
(bitset_not, bitset_merge, bitset_mask, re_string_char_size_at)
(re_string_wchar_at, re_string_elem_size_at):
Mark function as possibly unused.

2013-02-12  Andreas Schwab  <schwab@suse.de>  [BZ #11561]
* lib/regcomp.c (parse_bracket_exp) [_LIBC]: When looking up collating
elements compare against the byte sequence of it, not its name.