* include/limits.h (ULONG_MAX): New macro.
* include/locale.h (LC_ALL, LC_NUMERIC): New macro.
* lib/stub/setlocale.c: New file.
* lib/stub/sigaddset.c: New file.
* lib/libc+gnu.c: Include them.
Throughout, make these changes
Copyright headers: GNU Mes
First mention of name: GNU Mes
Website: https://www.gnu.org/software/mes
Git: git://git.savannah.gnu.org/mes.git
* lib/linux+gnu.c (getpid, signal): New function.
* include/signal.h: Declare signal.
* include/unistd.h: Declare getpid.
* scaffold/tests/95-signal.c: Test it.
* build-aux/check-mescc.sh (tests): Run it.