os/mac/pkgconfig_spec: fix brew style.
os/mac/pkgconfig_spec: fix brew style.

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