Merge from libc:
* regex.c (wcs_regex_compile): Use appropriate string
to compare with collating element.
Fix the padding for the alignment.
From-SVN: r44838
Merge from glibc:
* regex.c: Declare wcs functions only if compiling with
MBS_SUPPORT.
Don't use #elif for traditional C.
* regex.c: Revamp memory allocation for WCHAR functions to
not use too much stack.
From-SVN: r44471
