Revert "Set hints to find the python version we actually want. (ros2#451

)"

This reverts commit 24431ba.

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.20)
+cmake_minimum_required(VERSION 3.12)
 
 project(rcutils)
 
@@ -22,21 +22,6 @@ include(CheckLibraryExists)
 find_package(ament_cmake_python REQUIRED)
 find_package(ament_cmake_ros REQUIRED)
 
-# By default, without the settings below, find_package(Python3) will attempt
-# to find the newest python version it can, and additionally will find the
-# most specific version.  For instance, on a system that has
-# /usr/bin/python3.10, /usr/bin/python3.11, and /usr/bin/python3, it will find
-# /usr/bin/python3.11, even if /usr/bin/python3 points to /usr/bin/python3.10.
-# The behavior we want is to prefer the "system" installed version unless the
-# user specifically tells us othewise through the Python3_EXECUTABLE hint.
-# Setting CMP0094 to NEW means that the search will stop after the first
-# python version is found.  Setting Python3_FIND_UNVERSIONED_NAMES means that
-# the search will prefer /usr/bin/python3 over /usr/bin/python3.11.  And that
-# latter functionality is only available in CMake 3.20 or later, so we need
-# at least that version.
-cmake_policy(SET CMP0094 NEW)
-set(Python3_FIND_UNVERSIONED_NAMES FIRST)
-
 find_package(Python3 REQUIRED COMPONENTS Interpreter)
 
 ament_python_install_package(${PROJECT_NAME})