clang requires libxlm2, on darwin at least
systemd: porting patches for arm for udev.

Related to our glibc version, probably fixed in newer glibcs like
in stdenv-updates.
vimprobable2: updating to 1.2.0
nm-applet: Update to 0.9.6.4
nix: Update to 1.4pre3048_99ed558
procps-ng: Add

This will replace procps eventually.
taskcoach: updating to 1.3.22
Update zabbix2 to 2.0.4
upower: Update to 0.9.19
pm-utils: Remove some powersave hooks

In particular, this should unbreak nix.readOnlyStore.
pm-utils: Set meta.platforms
ec2-ami-tools: Update to 1.4.0.9
With !allowUnfree, reject unfree-redistributable packages as well