[ Maximiliano Curia ]
* New upstream release (4.8.3).
* Use the new PHONON_INSTALL_QT_EXTENSIONS_INTO_SYSTEM_QT build
  option.
* Refresh patches.
* Update phonon_is_not_forced_in_KDE patch
* Import upstream patch:
  upstream_dont_allocate_a_char_with_undefined_size
* Import upstream patch: upstream_fix_build_with_qt_5.4.2
* New patch: fix_include_dirs
* Add ecm build dep.
* Update symbols files.
* Update install files.
* Bump Standards-Version to 3.9.6, no changes needed.