Compiling DMD with C++11

[bearophile]

Andre Artus:

> I decided to see whether dmd would compile with VS2013 and 
> Clang. So far the only issue seems to be that C++11 RTL already 
> defines 'strtold'.

I suggest to put most of those small bug reports in Bugzilla (or 
better if you want as a patch in GitHub to fix them).

Bye,
bearophile