gitlab-ci: drop workaround for Python certificate store on Windows

On Windows, we have been running into some issues in the past where the certificate store for Python is broken on the GitLab CI runners using Windows. The consequence was that we weren't able to establish any SSL connections via Python, but we need that feature so that we can download the Meson wraps. The workaround we employed was to import certificates from the cURL project into the certificate store via OpenSSL. This is obviously an ugly workaround. But even more importantly, this workaround fails every time Chocolatey updates its OpenSSL packages. The problem here is that the old OpenSSL package installer will be removed immediately once the newer version was published, But the Chocolatey community repository may not yet have propagated the new version of this package to all of its caches. The result is that for a couple hours (or sometimes even one or two days) we always fail to install OpenSSL until the new version was propagated. Luckily though, it turns out that the workaround doesn't seem to be required anymore. Drop it to work around the intermittent failures and to clean up some now-unneeded legacy cruft. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>