Add instruction on how to handle the potential linker error on Linux (#47593)
Summary:
The original issue is https://github.com/pytorch/pytorch/issues/16683, which contains a https://github.com/pytorch/pytorch/issues/16683#issuecomment-459982988 that suggests manually un-shadowing the `ld`.
A better approach can be found at https://github.com/ContinuumIO/anaconda-issues/issues/11152#issuecomment-573120962, which suggests that using a newer version can effectively fix this.
It took me quite some time to realize that this is in fact an issue caused by Anaconda. I think we should add it in README.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47593
Reviewed By: ailzhang
Differential Revision: D24866092
Pulled By: heitorschueroff
fbshipit-source-id: c1f51864d23fd6f4f63a117496d8619053e35196
