message: Forcibly remove CARGO_HTTP_CHECK_REVOKE when testing
  This'll tweak error messages and cause tests to fail
diff: @@ -55,6 +55,11 @@ fn _process(t: &OsStr) -> cargo::util::ProcessBuilder {
  // can switch this to one and then fix the tests.
  .env("CARGO_INCREMENTAL", "0")
  + // This env var can switch the git backend from libgit2 to git2-curl, which
  + // can tweak error messages and cause some tests to fail, so let's forcibly
  + // remove it.
  + .env_remove("CARGO_HTTP_CHECK_REVOKE")
  +
  .env_remove("__CARGO_DEFAULT_LIB_METADATA")
  .env_remove("RUSTC")
  .env_remove("RUSTDOC")
  