mono/mono — pull request #649 by DavidS (2013-05-27 10:55:03+00:00)
Title: xbuild: use the AdditionalReferencePath items to locate assemblies

This is a little underdocumented feature of MSBuild. Items with the name
"AdditionalReferencePath" get searched for referenced assemblies. This helps
with some scenarios, e.g. when the assembly has to be references from a central
location.