Use GDC from Semaphore and upgrade the minimally required host compiler #1520
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Now that GDC on the latest Ubuntu 18.04 is built on top 2.076 (master is at 2.082 btw), we can upgrade it and thus finally increase the minimall required D version to build Dub (for DMD it's 2.079 btw, so we could increase a lot here, for now I wasn't so drastic though).
I used SemaphoreCI, because gdcdownloads.org still doesn't provide binaries for the newest GDC release.
See also: dlang/dmd#8431