Changed mscorlib reference from path to partial name to work around build problem on x64

classpath/classpath.build

@@ -49,7 +49,7 @@
           <arg value="-recurse:${Classpath.dir}/resource/*.properties" />
           <arg value="-recurse:${Classpath.dir}/resource/javax.*" />
           <arg value="-recurse:${Classpath.dir}/resource/org.xml.*" />
-          <arg value="-r:${framework::get-assembly-directory(framework::get-target-framework())}/mscorlib.dll" />
+          <arg value="-r:mscorlib" />
           <arg value="-r:${framework::get-assembly-directory(framework::get-target-framework())}/System.dll" />
 <!--
           <arg value="-r:C:\Program Files\Microsoft Visual Studio 8\SmartDevices\SDK\CompactFramework\2.0\v2.0\WindowsCE\System.dll" />