[Issue 18808] dmd not found after installation using script

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18808

--- Comment #2 from bachmeil at yahoo.com ---
That is almost certainly correct. I guess the point is that we shouldn't call
something an official install script if it doesn't do a proper installation. If
the user has to manually run that command every time they use DMD, or figure
out for themselves how to fix it, the installer isn't doing its job.

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