Fix kernel/mapping plugin output dir and IfcViewer link dependencies

Use $<TARGET_FILE_DIR:IfcGeom> instead of hardcoded
${CMAKE_BINARY_DIR}/ifcgeom/$<CONFIG> for plugin runtime dirs — the
old path was wrong on non-MSVC generators where $<CONFIG> expands
empty. Add explicit add_dependencies for kernel/mapping plugins so
IfcViewer waits for them to build, and drop the redundant direct link
against ${kernel_libraries}.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ifcviewer/CMakeLists.txt

@@ -40,10 +40,11 @@ set_target_properties(IfcViewer PROPERTIES
     MACOSX_BUNDLE ON
 )
 
+add_dependencies(IfcViewer ${kernel_libraries} ${mapping_libraries})
+
 target_link_libraries(IfcViewer PRIVATE
     IfcGeom
     IfcParse
-    ${kernel_libraries}
     ${OpenCASCADE_LIBRARIES}
     ${Boost_LIBRARIES}
     ${CGAL_LIBRARIES}