WiX: Package SwiftIfConfig.dll

This DLL is now a required part of the build.

Author: Steelskin

platforms/Windows/bld/bld.wxi

@@ -485,6 +485,9 @@
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\SwiftIDEUtils.dll" />
       </Component>
+      <Component>
+        <File Source="$(ToolchainRoot)\usr\bin\SwiftIfConfig.dll" />
+      </Component>
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\SwiftLibraryPluginProvider.dll" />
       </Component>