Auto merge of #5085 - matklad:rust-1.25.0-tls, r=alexcrichton
authorbors <bors@rust-lang.org>
Mon, 26 Feb 2018 21:17:55 +0000 (21:17 +0000)
committerbors <bors@rust-lang.org>
Mon, 26 Feb 2018 21:17:55 +0000 (21:17 +0000)
[beta] warn about TLS for github specifically

Backport of https://github.com/rust-lang/cargo/pull/5069 to beta

r? @alexcrichton


Trivial merge