Revert "Emit warning when trying to use PGO in conjunction with unwinding on Windows."
Revert "Emit warning when trying to use PGO in conjunction with unwinding on Windows."

This reverts commit 74a39a39a4a0650d110083afa6e0b226f7b61ca9.

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust