Merge branch '3.3-maint'

Merge branch '3.3-maint'

* 3.3-maint:
  Update NEWS
  Add test for directory in ignore_headers_in_manifest
  Fix DIR_DELIM_CH for win32 and non-win32 platforms, values were mixed up
  Update NEWS
  Tweak source code format
  Support using multiple -fdebug-prefix-map
  Fixed the check for empty object file vs diagnostics
  Removed time_of_compilation check wrt SLOPPY_FILE_STAT_MATCHES
  Revert "Better parsing of g* Options, and only use last argument"
  Test that the order of debug options is kept