Release Candidate 2.073.0-rc1

[Rainer Schuetze via Digitalmars-d-announce]

On 19.01.2017 08:32, Suliman wrote:
> http://dlang.org/changelog/2.073.0.html#mscrtlib-option
> How can I set this flag in dub.json? I tried:
> "dflags": [ "-mscrt=msvcrt" ]
> but got error:
> Error: unrecognized switch '-mscrt=msvcrt'

Ouch, the switch is actually called -mscrtlib. We need to fix the 
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