NEWS: Explain the s390 jmp_buf / ucontext_t ABI change reversal.
Fix -Wundef warnings in fnmatch.c

Fixes -Wundef warnings for MBSTATE_T and HAVE_STRING_H.  The
HAVE_STRING_H bit is a merge from the gnulib fnmatch.c and the
MBSTATE_T fix has been posted to gnulib for inclusion.
Check if DEBUG is defined in regex_internal.c

The DEBUG macro is checked for its value in one place and if it is
defined in another.  Make this consistent across the two cases and use
the same style that we did in mktime.c, which is to check if the macro
is defined and it is set.
Fix -Wundef warnings in regex_internal.h
ARM: Move PTR_MANGLE et al out of Linux-specific file.
Force eval for fma implementations