Remove shebang in setup.py

[ocourtin]

Hi,

Related to PEP 394, some Linux distributions (at the very least Ubuntu) use 'python' interpreter name for Python 2, and 'python3' for Python 3.

As in setup.py there's a check for pillow vs pillow-simd, keeping an explicit '/usr/bin/env python' leads to search for Python 2 package, even if the install is targeted for Python 3.

So keeping the shebang, seems not only useless, but become an issue, and forbid to install torchvision with pillow-simd in Python3 env.

Thanks in advance to considering applying this PR.

[codecov-io]

Codecov Report

Merging #773 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #773   +/-   ##
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  Coverage   40.99%   40.99%           
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  Files          29       29           
  Lines        2747     2747           
  Branches      432      432           
=======================================
  Hits         1126     1126           
  Misses       1542     1542           
  Partials       79       79

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[soumith]

thanks!