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gist-logs: don’t upload on unsupported configurations.

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