Arch Linux is adding source signing PGP keys to their package source
tree alongside PKGBUILDs in the form keys/pgp/$fingerprint.asc. As the
PGP keyserver infrastructure is a mess, this helps other people validate
sources in a PKGBUILD.
Add the keys to source packages if found alongside the PKGBUILD.
Signed-off-by: Allan McRae <allan@archlinux.org>