Include custom_ops and XNNPACK in executor_runner if built

Somebody (larryliu0820?) pointed out that there's no particular
reason to require a separate xnn_executor_runner target, and indeed we
already put several other optimized things in here if they're built.

ghstack-source-id: 1938f3c
ghstack-comment-id: 2722889450
Pull Request resolved: #9248

Author: swolchok

CMakeLists.txt

@@ -42,7 +42,7 @@
 # It should also be cmake-lint clean.
 #
 
-cmake_minimum_required(VERSION 3.19)
+cmake_minimum_required(VERSION 3.24)
 project(executorch)
 include(build/Utils.cmake)
 include(CMakeDependentOption)
@@ -914,6 +914,14 @@ if(EXECUTORCH_BUILD_EXECUTOR_RUNNER)
     list(APPEND _executor_runner_libs quantized_ops_lib)
   endif()
 
+  if(EXECUTORCH_BUILD_KERNELS_CUSTOM)
+    list(APPEND _executor_runner_libs $<LINK_LIBRARY:WHOLE_ARCHIVE,custom_ops>)
+  endif()
+
+  if(EXECUTORCH_BUILD_XNNPACK)
+    list(APPEND _executor_runner_libs xnnpack_backend)
+  endif()
+
   if(EXECUTORCH_ENABLE_EVENT_TRACER)
     if(EXECUTORCH_BUILD_DEVTOOLS)
       list(APPEND _executor_runner_libs etdump flatccrt)