Replace deprecated CMake Python modules

module FindPythonInterp was deprecated in 3.12.

This patch replaces the deprecated CMake module with one of the
suggested modules FindPython2. This new module looks only for version 2
of Python.

Author: RLovelett

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.12.4)
 
 # TODO: Fix RPATH usage to be CMP0068 compliant
 # Disable Policy CMP0068 for CMake 3.9
@@ -881,7 +881,7 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   endif()
 endif()
 
-find_package(PythonInterp REQUIRED)
+find_package(Python2 COMPONENTS Interpreter REQUIRED)
 
 #
 # Find optional dependencies.