zlib 1.2.8: Copy from homebrew/dupes for Linuxbrew
zlib 1.2.8: Copy from homebrew/dupes for Linuxbrew

openssl requires zlib on Linuxbrew, and openssl is required by git to
tap Homebrew/dupes for zlib, which creates a cyclic dependency.

See Homebrew/linuxbrew#447
See Homebrew/linuxbrew#474

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