D14914: Bindings: Use python version matching the found clang python module

[Stefan Brüns]

bruns created this revision.
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REVISION SUMMARY
  In case both python 2.7 and 3 are installed, but clang python bindings
  are only installed for python 3, there will be no error message but
  the self check will fail.
  
  Check for clang bindings for both python2 and python3 (if installed),
  and use the first one found to generate the sip bindings files.
  
  Note, it is possible to e.g. use python2 to generate the sip binding
  files (requires clang bindings), but generate bindings for python
  2, 3, or both (requires matching python-devel and python-sip-devel
  packages).

TEST PLAN
  install python3-clang bindings
  install python2-clang bindings
  or one of the above
  
  the matching python version is used to run sip_generator.py

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D14914

AFFECTED FILES
  find-modules/FindPythonModuleGeneration.cmake

To: bruns, #frameworks
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns
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