check_licenses: exclude intern/{libmv/opensubdiv}

These directories need manual updating, the licenses in existing files
have licenses that are valid but show many warnings.

Ignore these directories for now as it gets in the way of newly
introduced warnings.

check_source/check_licenses.py

@@ -404,6 +404,10 @@ def main() -> None:
                 # Practically an "extern" within an "intern" module, leave as-is.
                 "./intern/itasc/kdl",
 
+                # TODO: Files in these directories should be handled but the files have valid licenses.
+                "./intern/libmv",
+                "./intern/opensubdiv/",
+
                 # Files:
                 # This file is generated by a configure script (no point in manually setting the license).
                 "./build_files/build_environment/patches/config_gmpxx.h",