Add option to specify pip versions on windows #252
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As part of the initial setup for an environment on windows:
'python -m pip install --upgrade pip' is run unconditionally. However,
there are situtations where a specific version of pip is needed
(normally to avoid issues introduced in new pip releases). This commit
adds a new config env variable flag, CIBW_PIP_VERSION_WINDOWS, which
takes a pip version in that will be used for this command. For example,
if CIBW_PIP_VERSION_WINDOWS=19.3.1 then the windows environment setup
will run 'python -m pip install --upgrade pip=19.3.1'.
Fixes #250