sys_patch.py: Add proper KDK handling during root patching

resources/sys_patch_helpers.py

@@ -60,4 +60,14 @@ class sys_patch_helpers:
         plistlib.dump(data, Path(source_path_file).open("wb"), sort_keys=False)
         if Path(source_path_file).exists():
             return True
-        return False
+        return False
+
+
+    def determine_kdk_present(self):
+        # Check if KDK is present
+        if Path("/Library/Developer/KDKs").exists():
+            for kdk_folder in Path("/Library/Developer/KDKs").iterdir():
+                # We don't want to support mismatched KDKs
+                if self.constants.detected_os_build in kdk_folder.name:
+                    return kdk_folder
+        return None