D15070: Bindings: Query the install directory from python

[Stefan Brüns]

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REVISION SUMMARY
  The correct install directory is distro and arch specific, and should
  match the configuration of the python installation the binding is
  generated for.
  The directories can be queried using pythons distutils.sysconfig.
  In the unlikely case this does not match expectations, the directory can
  be overridden using -DGPB_PYTHON{2,3}_SITEARCH="<dir>".

TEST PLAN
  On a distro where sitearch is not below /usr/lib/pythonM.m/, but
  /usr/lib64/pythonM.m/ (e.g. RH, SUSE 64bit), try to do:
  
  cmake ..; make; install
  
  Without the patch, the binding are installed into the wrong directory,
  afterwards the correct path is used.
  
  This should also yield the correct path on Debian and derivatives,
  where dist-packages instead of site-packages is used (untested).

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  python3_support

REVISION DETAIL
  https://phabricator.kde.org/D15070

AFFECTED FILES
  find-modules/FindPythonModuleGeneration.cmake

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