message: cmake: disable false positives with GCC 4.8.3
diff: @@ -29,7 +29,7 @@ else()
  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5)
  - set(warnings "${warnings} -Wno-shadow")
  + set(warnings "${warnings} -Wno-shadow -Wno-effc++")
  endif()
  if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6)
  set(warnings "${warnings} -Wduplicated-cond -Wnull-dereference")
  