gcc: Compare system glibc version to brewed version [Linux]
gcc: Compare system glibc version to brewed version [Linux]

This reverts commit dd2394ede15089d058fa61fcdfa257dc5f045fce.

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