bugfix: build on Arch; missing deps + workaround for czmq

czmq-2.2.0 currently does not compile with a recent glibc (which
is mostly an issue on Arch Linux ATM) as it uses the deprecated
define _BSD_SOURCE.
As updating to czmq-3.0.0 is probably non-trivial, I added a
patch to use _DEFAULT_SOURCE instead as a workaround.
Also added some packages to the dependency list which, though
usually present, are missing on a basic Arch installation.