message: Remove old gcc 8 homebrew readme instructions for mac
diff: @@ -60,10 +60,6 @@ To enable XACC Python support, ensure that `python3` is set to your desired vers
  find the corresponding development headers. Ensure that when you try to run XACC-enabled Python scripts
  you are using the same `python3` executable that was set during your build.
  -On Mac OS X, we recommend our users install GCC 8 via Homebrew instead of relying
  -on XCode command line tools installation and the default Apple Clang compilers.
  -See [here](https://xacc.readthedocs.io/en/latest/install.html#mac-os-x) for more details on this.
  -
  Clone the repository recursively, configure with `cmake` and build with `make`
  ```bash
  $ git clone https://github.com/eclipse/xacc
  