archlinux/devtools!109 (comment 74475)

Plus add missing dependency reported by checkpkg

Update to git snapshot, fixes FS#54808, AVG-349
Remove .git when running make check, the testsuite checks for non-public commits in submodules, which fails when building from chroot
Update description, spice client is no more, fixes FS#46827

Add signature
Switch to https
Use sha256 instead of md5