[bpo-30916] Pre-build OpenSSL and Tcl/Tk for Windows (#2688)

Updates ssl and tkinter projects to use pre-built externals
diff --git a/PCbuild/_ssl.vcxproj.filters b/PCbuild/_ssl.vcxproj.filters
index 78b1459..bd46b60 100644
--- a/PCbuild/_ssl.vcxproj.filters
+++ b/PCbuild/_ssl.vcxproj.filters
@@ -9,5 +9,11 @@
     <ClCompile Include="..\Modules\_ssl.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="$(opensslIncludeDir)\applink.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="..\PC\python_nt.rc" />
   </ItemGroup>
 </Project>
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