Update adding the subdirectory for darwin/aarch64

Author: AlyElashram

libc/src/setjmp/CMakeLists.txt

@@ -1,4 +1,3 @@
-add_subdirectory(darwin/aarch64)
 if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
   add_object_library(
@@ -13,6 +12,10 @@ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
 endif()
 
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE})
+  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE})
+endif()
+
 add_entrypoint_object(
   setjmp
   ALIAS