Don't propagate INSTALL_INTERFACE headers for modules with no syncqt

If syncqt was not executed for a module, it will not have generated
headers, so we should not propagate the include/${module} header
location in that case.

Change-Id: I6dc0628a11ababb4d237215a9f4d3fc331383848
Reviewed-by: Liang Qi <liang.qi@qt.io>
Reviewed-by: Qt CMake Build Bot

cmake/QtBuild.cmake

@@ -1325,7 +1325,7 @@ function(add_qt_module target)
                     "$<BUILD_INTERFACE:${module_include_dir}>")
     endif()
 
-    if(NOT arg_NO_MODULE_HEADERS)
+    if(NOT arg_NO_MODULE_HEADERS AND NOT arg_NO_SYNC_QT)
         # For the syncqt headers
         list(APPEND public_includes "$<INSTALL_INTERFACE:include/${module}>")
     endif()