Give the current Python version to the CMake builder when building the Linphone Python module.

prepare.py

@@ -77,6 +77,7 @@ class PythonTarget(prepare.Target):
         self.config_file = 'configs/config-python.cmake'
         self.output = 'OUTPUT/' + self.name
         self.external_source_path = os.path.join(current_path, 'submodules')
+        self.additional_args += ["-DLINPHONE_BUILDER_PYTHON_VERSION={}.{}".format(sys.version_info.major, sys.version_info.minor)]
 
 
 class PythonRaspberryTarget(prepare.Target):