fixed on build error xcopy on localized machines (microsoft#847)

* fixed on build error xcopy on localized machines

echo ( f | xcopy ) will not work, can get around with putting an '*' at the end, xcopy will treat then as file. This solutions builds 
fine on DE German machine.

* removed echo | f it's not longer needed 

set cmd switch to capital /Y from lower

src/cppwinrt.build.post.props

@@ -26,15 +26,15 @@
     <PostBuildEvent Condition="'$(Platform)'!='Win32'">
       <Command>
         echo OutDir=$(OutDir)
-        (echo f | xcopy /y &quot;$(OutDir)$(ProjectName).dll&quot; &quot;$(OpenConsoleDir)$(Platform)\$(Configuration)\$(ProjectName).dll&quot; )
-        (echo f | xcopy /y &quot;$(OutDir)$(ProjectName).pdb&quot; &quot;$(OpenConsoleDir)$(Platform)\$(Configuration)\$(ProjectName).pdb&quot; )
+        (xcopy /Y &quot;$(OutDir)$(ProjectName).dll&quot; &quot;$(OpenConsoleDir)$(Platform)\$(Configuration)\$(ProjectName).dll*&quot; )
+        (xcopy /Y &quot;$(OutDir)$(ProjectName).pdb&quot; &quot;$(OpenConsoleDir)$(Platform)\$(Configuration)\$(ProjectName).pdb*&quot; )
       </Command>
     </PostBuildEvent>
     <PostBuildEvent Condition="'$(Platform)'=='Win32'">
       <Command>
         echo OutDir=$(OutDir)
-        (echo f | xcopy /y &quot;$(OutDir)$(ProjectName).dll&quot; &quot;$(OpenConsoleDir)$(Configuration)\$(ProjectName).dll&quot; )
-        (echo f | xcopy /y &quot;$(OutDir)$(ProjectName).pdb&quot; &quot;$(OpenConsoleDir)$(Configuration)\$(ProjectName).pdb&quot; )
+        (xcopy /Y &quot;$(OutDir)$(ProjectName).dll&quot; &quot;$(OpenConsoleDir)$(Configuration)\$(ProjectName).dll*&quot; )
+        (xcopy /Y &quot;$(OutDir)$(ProjectName).pdb&quot; &quot;$(OpenConsoleDir)$(Configuration)\$(ProjectName).pdb*&quot; )
       </Command>
     </PostBuildEvent>
   </ItemDefinitionGroup>