circle.yml: Remove libwmf-dev
circle.yml: Remove libwmf-dev

See https://github.com/Linuxbrew/homebrew-core/pull/1538

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