dmd 1.042 and 2.027 releases

[bearophile]

Walter Bright:

>On Windows, if there are multiple source files on the command line they are now read with a background thread. This may speed up compilation.<

I have tried on Windows, on a 2-core CPU and the CPU usage is about 50% still (only one core used). I have not timed much difference in compilation times (it's 24 modules).

Bye,
bearophile