SemaphoreCI: Use -lowmem when building dmd-testsuite tools in parallel
This worked fine in the PR introducing the parallel build of these tools, but now fails, at least sometimes. The reason is simple, ~2.4 GB of available memory for Shippable, and compilation of d_do_test alone requiring about 1.7 GB on my Win64 machine (a bit more for the unittests). -lowmem works very well here, reducing it to 0.5-0.6 GB.
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