strtoimax, strtoumax: Relicense under LGPL. * modules/strtoimax (License): Change to LGPL. * modules/strtoumax (License): Likewise. With permission from Jim Meyering, Paul Eggert: <http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00124.html> <http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00109.html>