systemd: Remove dependency on XML::Parser for Linuxbrew
systemd: Remove dependency on XML::Parser for Linuxbrew

Linuxbrew/homebrew-core,Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,LinuxbrewTestBot/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core