headers: relax license to LGPLv2+ The replacement headers deserve relaxed licenses, even if the functions they declare cannot be accessed without a tighter license. See the list archives for consensus on this action. * modules/fcntl-h (License): Relax license. * modules/getopt-posix (License): Likewise. * modules/locale (License): Likewise. * modules/math (License): Likewise. * modules/pty (License): Likewise. * modules/sched (License): Likewise. * modules/search (License): Likewise. * modules/spawn (License): Likewise. * modules/stdarg (License): Likewise. * modules/sysexits (License): Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>