Fix broadcom-sta on linux >= 3.15

http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-wireless/broadcom-sta/files/broadcom-sta-6.30.223.141-linux-3.15.patch?view=markup
gnupg1: update to version 1.4.17
nixos/elasticsearch: add '.' at end of description strings

Nixos option descriptions should be full sentences, ending in a full
stop. (Package descriptions, on the other hand, should not.)
nixos/elasticsearch: capitalize systemd service description
nixos: add some missing '.' in option descriptions
diffstat: weaken platform requirement

This fixes a change made in 3ae765278f0e5d75e3d18ebac29c25780b92e9ee.
syslog-ng: Enable systemd support