roll-it-up.sh: generate CHECKSUMS file in each directory
roll-it-up.sh: generate CHECKSUMS file in each directory

Signed-off-by: Alan Coopersmith <24840e9dbe35fcdfa1c589fe14ed564b1ea94702@freedesktop.org>

freedesktop-unofficial-mirror/xorg__util__modular,freedesktop-unofficial-mirror/xorg__util__modular,freedesktop-unofficial-mirror/xorg__util__modular