geerlingguy
Adds a patch to ATLAS for grep 3.8+
[!NOTE] Moved this to a new pull request due to #15
When testing newer distros (Arch and Fedora), I encountered an issue with ATLAS that would cause the configuration step to fail. This was due to grep 3.8 and newer throwing a warning into the output saying 'fgrep: warning: fgrep is obsolescent; using grep -F.' This, in turn, would cause ATLAS to fail to find the information it is looking for and fail to configure properly. I added patch-atlas-src.yml, which fixes this issue on affected systems.
Thank you! As I mentioned in the other PR, I'm going to hold off merging this until I decide whether to stick with ATLAS for the time being (for consistency), or switch to OpenBLAS or Blis.
