mksh: update to R48b
Merge pull request #130 from Ypnose/master

mksh: update to R48b
isl: update to 0.12.1.
enlightenment: fix #131 (Enlightenment is not listed in GDM/KDM).
iptables: update to 1.4.20.
iptables: drop obsolete conf_file.
libbsd: update to 0.6.0.
xbps-git: bump version.