WiX: add SwiftIDEUtils.dll to the image

This adds an additional DLL to the image.  The compiler is now able to
vend enough of the swift-syntax library to enable building the LSP
without adding a second copy of the parser.  This shaves ~6MiB off of
the LSP binary.

Author: compnerd

platforms/Windows/bld/bld.wxs

@@ -342,6 +342,9 @@
       <Component>
         <File Source="$(TOOLCHAIN_ROOT)\usr\bin\SwiftDiagnostics.dll" />
       </Component>
+      <Component>
+        <File Source="$(TOOLCHAIN_ROOT)\usr\bin\SwiftIDEUtils.dll" />
+      </Component>
       <Component>
         <File Source="$(TOOLCHAIN_ROOT)\usr\bin\SwiftOperators.dll" />
       </Component>