support.py: Ignore non-kext files

opencore_legacy_patcher/sys_patch/kernelcache/kernel_collection/support.py

@@ -33,6 +33,8 @@ class KernelCacheSupport:
                 ["teamID"] =           Team ID (blank on ad-hoc signed)
             To grab the CDHash of a kext, run 'codesign -dvvv <kext_path>'
         """
+        if not kext_name.endswith(".kext"):
+            return False
 
         try:
             aux_cache_path = Path(self.mount_location_data) / Path("/private/var/db/KernelExtensionManagement/AuxKC/CurrentAuxKC/com.apple.kcgen.instructions.plist")