Add Self programming language
glibc_multi: move glibc_multi script out of all-packages.nix
nixos/dhcpcd: Add an explicit interfaces option
nixos/dhcpcd: Use null instead of empty list to disable allowInterfaces
Merge pull request #3225 from hrdinka/move-glibc-multi

glibc_multi: move glibc_multi script out of all-packages.nix
Merge pull request #3200 from wkennington/master.dhcpcd

nixos/dhcpcd: Add an explicit interfaces option
Merge pull request #3175 from doublec/self

Add Self programming language