Should gdmd be included with gdc?

[Chris Piker via D.gnu]

Hi GDC

Attempting to use meson I found that I probably need dub, but 
building dub requires dmd command line emulation. The external 
gdmd perl script to handles this course, but should there be a 
gdmd binary that is built while producing gdc?  Pulling in a 
whole extra language interpreter seems like a big dependency when 
bootstrapping the toolchain.

On the other hand, maybe dub's build.d should be updated to 
understand native gdc command lines, not sure which option is 
best.