It takes a bit for the propxy to get ready to accept connections, so start it before the build so we can be reasonably sure that it's going to be ready in time.
Coverity fixes round 6
The tests have never run successfully and we do have successful builds of mingw-w64, so remove these CI builds which do not add value.
Curl by default does not report errors by setting the error code.
As the upload can fail through several conditions (e.g. the rate
limit, leading to unauthorized access) we should indicate this
information in Travis CI.
To improve upon the behavior, use `--write-out=%{http_code}` to
write out the HTTP code in addition to the received body and
return an error if the code does not equal 201.
We were missing this test on Windows, which meant we didn't notice that we never fixed the single authentication attempt it tries, nor its wrong return code. Enable this for the unix platforms as well over HTTP. We previously were doing it locally but disabled it on OS X due to issues with its sshd not accepting password authentication.
We commonly have to check if a git_buf has been allocated correctly or if we ran out of memory. Introduce a new macro similar to `GITERR_CHECK_ALLOC` which checks if we ran OOM and if so returns an error. Provide a `#nodef` for Coverity to mark the error case as an abort path.