Remove NFMDP_PE_LoadHints from nfproj (#105)

***NO_CI***

Author: networkfusion

nanoFramework.Networking.Sntp/nanoFramework.Networking.Sntp.nfproj

@@ -38,11 +38,6 @@
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>
   </ItemGroup>
-  <ItemGroup>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.10.5\lib\mscorlib.dll">
-      <InProject>false</InProject>
-    </NFMDP_PE_LoadHints>
-  </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
   <ItemGroup>
     <Compile Include="Sntp.cs" />