chroot-gcc: update to 4.9.0.
gcc{,-multilib}: update to 4.9.0.
xbps-src: remove autodeps before updating bootstrap pkgs.
xbps-src: only remove autodeps if chroot is ready.
gcc: add missing libcilkrts-devel subpkg; correct libgomp-devel files.
gcc: do not depend on cilkrts/vtv; those are not built on arm.
gcc: typo fix.
gcc: fix libcilkrts-devel typos (omg).
gcc: fix libcilkrts-devel again; there's no info file.
perl{,-*}: fix license

base-files: add GPL-1 license