dmd Backend converted to Boost License

[Joakim via Digitalmars-d-announce]

On Friday, 7 April 2017 at 15:14:40 UTC, Walter Bright wrote:
> https://github.com/dlang/dmd/pull/6680
>
> Yes, this is for real! Symantec has given their permission to 
> relicense it. Thank you, Symantec!

That was nice of Symantec to finally grant your request.  Will 
this mean more work put into the backend?  Regardless, good to 
stop the FUD about the backend licensing.