Auto merge of #8530 - ehuss:ci-force-curl, r=alexcrichton
Auto merge of #8530 - ehuss:ci-force-curl, r=alexcrichton

Update features set in CI.

This removes the `curl/force-system-lib-on-osx` feature, which I don't think has been needed for a while (I believe it was fixed with https://github.com/alexcrichton/curl-rust/pull/283).

This also uses the same features for `test -p cargo-test-support` so that cargo doesn't get recompiled (saving about a minute).

tshepang/cargo,rustyhorde/cargo,rustyhorde/cargo,tshepang/cargo,tsurai/cargo,nipunn1313/cargo,eminence/cargo,eminence/cargo,rust-lang/cargo,tsurai/cargo,rustyhorde/cargo,tsurai/cargo,rust-lang/cargo,tshepang/cargo,nipunn1313/cargo,eminence/cargo,nipunn1313/cargo,tsurai/cargo,tsurai/cargo,rust-lang/cargo,rust-lang/cargo,eminence/cargo,tshepang/cargo,nipunn1313/cargo,rustyhorde/cargo