Revert "show options for -W help and -W". Fixes #11458.

This reverts commit 1009c21ad7b1db366a5c600946652cc490598ec1.
auto merge of #11574 : neeee/rust/master, r=alexcrichton

Reverted according to https://github.com/mozilla/rust/issues/11458#issuecomment-32269477. Fixes #11458.