Remove unused parameter in ProcessGroupGloo (#17718)
Summary:
This is not used anywhere and wasn't cleaned up prior to 1.0.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17718
Reviewed By: janewangfb
Differential Revision: D14355154
Pulled By: pietern
fbshipit-source-id: f8ff3c8f50cd6365b369a5c5b85d72d8940df048
