title: Brew won't run with released Xcode 11
body: <p>I installed the latest Xcode 11 release (11A420a) on Mojave 10.14.6 and now homebrew fails with</p>
  
  <p><code>Error: Xcode alone is not sufficient on Mojave.
  Install the Command Line Tools:
    xcode-select --install</code></p>
  
  <p>The command line tools are installed</p>
  
  <p><code>$ xcode-select --install
  xcode-select: error: command line tools are already installed, use "Software Update" to install updates</code></p>
  
  <p>Any idea how to get past this?</p>