disable onnx py3 gcc5 build (#31100)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31100
This appears to not work right now. Disabling pending an investigation.
Test Plan: Imported from OSS
Differential Revision: D18928777
Pulled By: suo
fbshipit-source-id: 63089131bad98902979e5cf4373732c85badef9d
