cmake: do not use link groups

tools/cmake/project.cmake

@@ -356,8 +356,6 @@ macro(project project_name)
     add_executable(${project_elf} "${project_elf_src}")
     add_dependencies(${project_elf} _project_elf_src)
 
-    target_link_libraries(${project_elf} "-Wl,--start-group")
-
     if(test_components)
         target_link_libraries(${project_elf} "-Wl,--whole-archive")
         foreach(test_component ${test_components})