Build against VS Mac 8.5 preview 1

Author: mrward

src/Common.Build.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <MDBinDir>$(MSBuildProjectDirectory)\..\..\..\monodevelop-8.1\main\build\bin</MDBinDir>
+    <MDBinDir>$(MSBuildProjectDirectory)\..\..\..\monodevelop-8.5-preview1\main\build\bin</MDBinDir>
   </PropertyGroup>
 </Project>