fontforge: Remove libpthread-stubs dependency for Linuxbrew
fontforge: Remove libpthread-stubs dependency for Linuxbrew

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