[Bug 775281] Allow simply setup an uninstalled environment based on msys2

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775281
Bug 775281 depends on bug 775292, which changed state.

Bug 775292 Summary: dtls: Set openssl's threadid the 1.0.x way
https://bugzilla.gnome.org/show_bug.cgi?id=775292

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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