CMake: Remove own FindPython modules, use standard FindPython3 instead
Summary:
- Do not rename PYTHON_EXECUTABLE variable to give a room for Python4 update.
This revision depends on D24065.
Test Plan: Configure and build in a clean environment.
Reviewers: KDE Telepathy, davidedmundson, apol, heikobecker
Reviewed By: apol, heikobecker
Tags: KDE Telepathy
Differential Revision: https://phabricator.kde.org/D24066