Enable HOMEBREW_PATCHELF_RB_WRITE by default
Enable HOMEBREW_PATCHELF_RB_WRITE by default

Enable HOMEBREW_PATCHELF_RB_WRITE by default for everyone except CI.
It may be disabled using HOMEBREW_NO_PATCHELF_RB_WRITE.
It may be enabled on CI using HOMEBREW_PATCHELF_RB_WRITE.

MikeMcQuaid/brew,vitorgalvao/brew,JCount/brew,konqui/brew,EricFromCanada/brew,Homebrew/brew,JCount/brew,EricFromCanada/brew,Homebrew/brew,MikeMcQuaid/brew,EricFromCanada/brew,konqui/brew,nandub/brew,claui/brew,claui/brew,Homebrew/brew,claui/brew,sjackman/homebrew,konqui/brew,nandub/brew,vitorgalvao/brew,JCount/brew,MikeMcQuaid/brew,Homebrew/brew,sjackman/homebrew,JCount/brew,sjackman/homebrew,vitorgalvao/brew,nandub/brew,MikeMcQuaid/brew,vitorgalvao/brew,sjackman/homebrew,nandub/brew,EricFromCanada/brew,claui/brew,konqui/brew