[aur-general] Store projects snapshots on sigurd

Hi TUs, VCS PKGBUILDs in officials repositories should use a snapshot of the project and shouldn't fetch the sources directly from git; neither the snapshot tarball created by git (checksum changes every time). In [extra], we already do that storing the snapshot at ftp://ftp.archlinux.org/other/ . This is useful when a project dead or when website is down too. Then, we just set up ftp://ftp.archlinux.org/other/community/ , so our TUs can store their snapshots. Please fix your PKGBUILD to use it, but also please *do not* abuse of it: few space left on sigurd. Cheers. -- Andrea