Auto merge of #8102 - alexcrichton:more-spurious, r=Eh2406
Auto merge of #8102 - alexcrichton:more-spurious, r=Eh2406

Whitelist another known spurious curl error

Seen recently in comments on #6788

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