windows: distribute vcredist loose files

Source/VSProps/Base.Dolphin.props

@@ -84,4 +84,16 @@
       <AdditionalOptions>/NODEFAULTLIB:msvcrt %(AdditionalOptions)</AdditionalOptions>
     </Link>
   </ItemDefinitionGroup>
+
+  <Target Name="CopyVCRedist" AfterTargets="Build" Condition="'$(ConfigurationType)'=='Application'">
+    <ItemGroup>
+      <VCRedistSourceFiles
+        Include="$(VCToolsRedistInstallDir)$(Platform)\Microsoft.VC$(PlatformToolsetVersion).CRT\*.dll" />
+    </ItemGroup>
+    <Copy
+      SourceFiles="@(VCRedistSourceFiles)"
+      DestinationFolder="$(BinaryOutputDir)"
+      SkipUnchangedFiles="true"
+    />
+  </Target>
 </Project>