CMake: Drop PYTHON_EXTENSION_MODULE_SUFFIX logic

Author: jschueller

src/swig/CMakeLists.txt

@@ -36,14 +36,6 @@ if (NUMPY_FOUND AND Python_FOUND)
 
   set_target_properties (nlopt_python PROPERTIES OUTPUT_NAME nlopt)
 
-  if (NOT DEFINED PYTHON_EXTENSION_MODULE_SUFFIX AND NOT CMAKE_CROSSCOMPILING)
-    execute_process (COMMAND ${Python_EXECUTABLE} -c "import importlib.machinery; print(importlib.machinery.EXTENSION_SUFFIXES[0])"
-                    OUTPUT_VARIABLE PYTHON_EXTENSION_MODULE_SUFFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
-  endif ()
-  if (DEFINED PYTHON_EXTENSION_MODULE_SUFFIX)
-    set_target_properties (nlopt_python PROPERTIES SUFFIX "${PYTHON_EXTENSION_MODULE_SUFFIX}")
-  endif ()
-
   install (FILES ${CMAKE_CURRENT_BINARY_DIR}/nlopt.py DESTINATION ${INSTALL_PYTHON_DIR})
   install (TARGETS nlopt_python DESTINATION ${INSTALL_PYTHON_DIR})