[aur-general] Support for remote sums in PKGBUILDs

[Jerome Leclanche]

Breaking away from an IRC convo from this morning; has support for
remote sums been considered for pacman?
It's currently possible to do this for .sig files (through the source
array), but not available for simple sha/md5 hashes. This would let
packagers do something like:
source=("http://example.com/downloads/$pkgname-$pkgver.tar.xz")
sha1sums=("http://example.com/downloads/$pkgname-$pkgver.tar.xz.sha1")

(Of course, only for servers that generate a programmatically
discoverable hash of some sort; but it's not actually uncommon)

J. Leclanche