gtk+3: Depends on at-spi2-atk for Linuxbrew
gtk+3: Depends on at-spi2-atk for Linuxbrew

Fix the error:
checking for ATK... no
configure: error: Package requirements (atk atk-bridge-2.0) were not met:
No package 'atk-bridge-2.0' found

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