NEW: lang/gdmd

Hi ports --

Attached is a new port, lang/gdmd. gdmd is a DMD-like wrapper for GDC.

---
pkg/DESCR:
gdmd is a DMD-like wrapper for GDC. It lets you use DMD-style command
line flags with GDC.
---

This wrapper is necessary for gdc to interface with the dub package
manager, which would enable D package management on all gdc-supported
platforms. See the dub port email (previously posted) for more info.

OK?

~Brian