DMD nightly

Nightly build of the reference D compiler (incl. Druntime and Phobos)

Note that the official date and commit will be outdated because this
release is continuously updated. The actually built revisions are:

Component	Revision
DMD	dlang/dmd@b6985bb
DRuntime	dlang/druntime@571de3c
Phobos	dlang/phobos@5ca44b7