message: Fixed and suppressed warnings produced by GCC 6.3.0
diff: @@ -38,7 +38,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
  set_source_files_properties(jcdctmgr.c PROPERTIES COMPILE_FLAGS "-O1")
  endif()
  -ocv_warnings_disable(CMAKE_C_FLAGS -Wcast-align -Wshadow -Wunused)
  +ocv_warnings_disable(CMAKE_C_FLAGS -Wcast-align -Wshadow -Wunused -Wshift-negative-value)
  ocv_warnings_disable(CMAKE_C_FLAGS -Wunused-parameter) # clang
  ocv_warnings_disable(CMAKE_C_FLAGS /wd4013 /wd4244 /wd4267) # vs2005
  