Auto merge of #4389 - flip1995:allow_win_failures, r=phansch
Auto merge of #4389 - flip1995:allow_win_failures, r=phansch

Allow windows failures on travis

The windows build breaks about every second travis run. Let's disable it, until we got a fix.

changelog: none

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