WiX: add SwiftMacros.dll to the image

This adds an additional DLL to the image. 'SwiftMacros.dll' includes
macro implementations for stdlib. e.g. 'TaskLocal'

Author: rintaro

platforms/Windows/bld/bld.wxs

@@ -322,6 +322,11 @@
         <File Source="$(TOOLCHAIN_ROOT)\usr\bin\ObservationMacros.dll" />
       </Component>
     </ComponentGroup>
+    <ComponentGroup Id="SwiftMacros" Directory="_usr_bin">
+      <Component>
+        <File Source="$(TOOLCHAIN_ROOT)\usr\bin\SwiftMacros.dll" />
+      </Component>
+    </ComponentGroup>
 
     <ComponentGroup Id="argument_parser" Directory="_usr_bin">
       <Component>