update in setup.py

[lasofivec]

Fixes #183

• Now we don't specify the gcc compiler for Mac OSX (or any OS). It will use the system's default compiler. This fixes the above mentioned Issue as well as prevent the need for a patch (on ITER servers)

• Passed black on the setup.py file.

[codecov-io]

Codecov Report

Merging #184 into devel will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            devel     #184   +/-   ##
=======================================
  Coverage   45.17%   45.17%           
=======================================
  Files          70       70           
  Lines       20611    20611           
=======================================
  Hits         9310     9310           
  Misses      11301    11301

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[Didou09]

Ok for me,
except: I don't see where we check for homebrew, do we ?

Ok with the PEP8 changes too

[lasofivec]

@Didou09 here we used to force which gcc was being used. By default homebrew's gcc is gcc-8.
Now we let the system's gcc