Determine linker used by LDC on Windows dynamically. Fixes #618.
Determine linker used by LDC on Windows dynamically. Fixes #618.

rjframe/dub,Flamaros/dub,p0nce/dub,grogancolin/dub,jelmansouri/dub,Geod24/dub,jeanbaptistelab/dub,gedaiu/dub,D-Programming-Language/dub