Skip the work around of disregarded dependencies for interface libraries

Support the old CMake.

Amends 085ed83bb3ae4842b7dba8ff1fbd086477d461bf

Change-Id: Ibcc8f51d0381a4843adcaec9ce58d13a9e69ef8c
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

cmake/QtAutogenHelpers.cmake

@@ -226,6 +226,11 @@ function(qt_internal_work_around_autogen_discarded_dependencies target)
         return()
     endif()
 
+    get_target_property(type "${target}" TYPE)
+    if(type STREQUAL "INTERFACE_LIBRARY")
+        return()
+    endif()
+
     set(libraries ${ARGN})
     set(final_libraries "")