Output the MSBuild Task in buildCrossTargetting as well (#77)

Author: einari

ILRepack.Lib.MSBuild.Task/build/ILRepack.Lib.MSBuild.Task.nuspec

@@ -19,6 +19,7 @@
     </metadata>
     <files>
         <file src="ILRepack.Lib.MSBuild.Task.dll" target="build"/>
+        <file src="ILRepack.Lib.MSBuild.Task.dll" target="buildCrossTargeting"/>
 		<file src="ILRepack.Lib.MSBuild.Task.targets" target="build"/>
 		<file src="ILRepack.Lib.MSBuild.Task.targets" target="buildCrossTargeting"/>
     </files>