Switch to new patch syntax
screen: use new patch syntax, fix deps
Use new patch syntax
gperf: use predefined keg-only reason
screen 4.2.1

Closes #301.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
screen: fix audit warning
screen: move patch into spec blocks
grep 2.20

Update to latest stable release and use HTTPS on homepage and mirror.