Ensure that wheels with native have all the same version

[pombredanne]

We have wheels that are for different platforms AND have a different version because they were built from different C/C++ source code versions and patches. For instance:

• extractcode_7z-16.2.2.1-py2.py3-none-manylinux2014_x86_64.whl
• extractcode_7z-16.2.4.1-py2.py3-none-macosx_10_13_intel.whl
• extractcode_7z-16.4.1-py2.py3-none-win_amd64.whl
• extractcode_7z-16.4.1-py2.py3-none-win32.whl
• extractcode_libarchive-3.4.2.1-py2.py3-none-macosx_10_13_intel.whl
• extractcode_libarchive-3.4.2.1-py2.py3-none-manylinux2014_x86_64.whl
• extractcode_libarchive-3.4.2.3-py2.py3-none-win_amd64.whl
• extractcode_libarchive-3.4.2.3-py2.py3-none-win32.whl
• typecode_libmagic-5.38.1-py2.py3-none-macosx_10_13_intel.whl
• typecode_libmagic-5.38.1-py2.py3-none-manylinux2014_x86_64.whl
• typecode_libmagic-5.38.1.1-py2.py3-none-win_amd64.whl
• typecode_libmagic-5.38.1.1-py2.py3-none-win32.whl

To pin requirements and use hashes, we cannot have easily multiple versions of the same wheel pinned for each different OS.

We should instead have a single version for a given plugin release.

[pombredanne]

this is done.