qt6_add_repc_sources produces an error if a genex is used for preprocessor macros

add_compile_definitions($<CONFIG>)

/home/user/Qt/Examples/Qt-6.6.1/remoteobjects/remoteobjects_server/CMakeLists.txt:39: error: Error evaluating generator expression:

  $<CONFIG$<ANGLE-R>;-o;/home/user/Qt/Examples/Qt-6.6.1/remoteobjects/build-remoteobjects_server-Desktop_Qt_6_6_1_GCC_64bit-Debug/moc_rep_timemodel_source.cpp;/home/user/Qt/Examples/Qt-6.6.1/remoteobjects/build-remoteobjects_server-Desktop_Qt_6_6_1_GCC_64bit-Debug/rep_timemodel_source.h>

Expression did not evaluate to a known generator expression

Call stack:
  /home/user/Qt/Examples/Qt-6.6.1/remoteobjects/remoteobjects_server/CMakeLists.txt:39 (qt6_add_repc_sources)
  /home/user/Qt/6.6.1/gcc_64/lib/cmake/Qt6RemoteObjects/Qt6RemoteObjectsMacros.cmake:93 (_qt_internal_add_repc_files)
  /home/user/Qt/6.6.1/gcc_64/lib/cmake/Qt6RemoteObjects/Qt6RemoteObjectsMacros.cmake:81 (qt6_wrap_cpp)
  /home/user/Qt/6.6.1/gcc_64/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:199 (_qt_internal_create_moc_command)
  /home/user/Qt/6.6.1/gcc_64/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:112 (file)