merge one-time variable

cmake/multipython/PyDependences.cmake

@@ -10,8 +10,7 @@ else()
     find_custom_python3(DEFAULT_PATH VERBOSE)
 endif()
 
-set(pyversion ${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR})
-set(pydst "${destination_root}python/${pyversion}")
+set(pydst "${destination_root}python/${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR}")
 set(destination_python "${pydst}/dist-packages/")
 set(destination_pypackage ${pydst}/wheel)