tools/nolibc: reformat list of headers to be installed

This makes it easier to add and remove more entries in the future
without creating spurious diff hunks.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>