Update to 2.8.4, from Leonardo Taccari via wip.

pkgsrc changes:
o Convert the osabi dependency to NOT_FOR_PLATFORM.
o Add LICENSE information (like www/webkit24-gtk)

Changes:
WebKitGTK+  2.8.4
=================
  - Make WebSQL work by using a default quota instead of always failing in openDatabase with
    DOM Exception 18.
  - Improve detection and usage of GL/GLES/EGL libraries.
  - Fix a crash on memory allocation using bmalloc on 32bit systems.
  - Fix DOCUMENT_VIEWER cache model to actually disable the memory cache.
  - Fix a WebProcess crash after too many redirect error when there's an active NPAPI plugin.
  - Fix a WebProcess crash when gtk-font-name setting is empty.
  - Ensure Math.abs() doesn't return negative.
  - Correctly restore accelerated compositing after a WebProcess crash.
  - Respect X-Frame-Options headers when loading from application cache.
  - Several crashes and rendering issues fixed.
  - Fix the MIPS N64 detection.
  - Fix several memory leaks.
  - Translation updates: Catalan.

WebKitGTK+  2.8.3
=================
  - Fixed a regression introduced in 2.8.2 that broke downloads when using the network
    process.
  - Fix the build with Netscape plugins disabled.
  - Fix XPixamps leaked by GLContext when using EGL on X11.

WebKitGTK+  2.8.2
=================
  - Fix network redirection to a non HTTP destination.
  - Use a webkit subdirectory for the disk cache to avoid conflicts with other
    files in the cache directory when the disk cache is cleaned up.
  - Do not preserve the Origin header on on cross-origin redirects.
  - Prevent WorkQueue objects from being leaked and ensure its worker thread
    always exits.

(wiz)