mktime, timegm: share common declaration * lib/mktime-internal.h: New file. * lib/mktime.c: Use it rather than open-coding a declaration. * lib/timegm.c: Likewise. * modules/mktime (Files): Ship it. * modules/timegm (Files): Likewise. Suggested by Bruno Haible. Signed-off-by: Eric Blake <ebb9@byu.net>

# See lib/git-merge-changelog.c for making this useful.
ChangeLog	merge=merge-changelog

# Run this to make 'git diff' on texinfo files give nicer hunk context:
#   git config diff.texinfo.funcname '^@node[	 ][	 ]*\\([^,][^,]*\\)'
*.texi* diff=texinfo