Merge pull request #31020 from compnerd/python-fallback

build: add a workaround for the build to use Python2 instead of Python3

Author: shahmishal

CMakeLists.txt

@@ -893,7 +893,13 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
 endif()
 
 find_package(Python2 COMPONENTS Interpreter REQUIRED)
-find_package(Python3 COMPONENTS Interpreter REQUIRED)
+find_package(Python3 COMPONENTS Interpreter)
+if(NOT Python3_Interpreter_FOUND)
+  message(WARNING "Python3 not found, using python2 as a fallback")
+  add_executable(Python3::Interpreter IMPORTED)
+  set_target_properties(Python3::Interpreter PROPERTIES
+    IMPORTED_LOCATION ${Python2_EXECUTABLE})
+endif()
 
 #
 # Find optional dependencies.