Description:
  don't trigger cmake build in third_party subdir.
  That's useless since we don't embed sources.
Index: pytorch-text/setup.py
===================================================================
--- pytorch-text.orig/setup.py
+++ pytorch-text/setup.py
@@ -101,7 +101,6 @@ setup_info = dict(
     # See here: https://github.com/pytorch/vision/issues/2134"
     ext_modules=setup_helpers.get_ext_modules(),
     cmdclass={
-        "build_ext": setup_helpers.CMakeBuild,
         "clean": clean,
     },
 )