[reSIProcate] [Patch] Fix for gcc-4.2.3 concept check failure in dum

[Byron Campen]

	Looks fine to me. I'll commit the patch.

Best regards,
Byron Campen

> I encountered a small issue in resip/dum/MergedRequestKey.hxx where it
> seems instances of the class are put into a container that requires it
> to be Assignable.  This seems to do this trick.  It's against 1.4.
>
> --  
> ----------------------------------------------------------
> Brad Spencer - spencer at starscale.com - www.starscale.com
> <dum-fix-concept- 
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