Log Message:
webkit-gtk: Update to 2.24.4

pkgsrc changes:
 - Permit to use Python 3.x for build
 - Update REPLACE_* lists and add tool dependency to bash
 - Remove no longer needed
   patch-Source_WebCore_platform_graphics_gstreamer_MediaPlayerPrivateGStreamer.cpp
   (fixed upstream)

Changes:
2.24.4
------
 - Updated the user agent string to make happy certain websites which
   would claim that the browser being used was unsupported.
 - Improve loading of multimedia streams to avoid memory exhaustion due
   to excessive caching.
 - Fix display of documents with MIME type application/xml in the Web
   Inspector, when loaded using XmlHttpRequest.
 - Fix a hang while scrolling certain websites which include HLS video
   content (Twitter, for example).
 - Fix rounding artifacts in volume levels for media playback.
 - Fix several crashes and rendering issues.
 - Fix the build with video track support disabled.
 - Fix the build with OpenGL support disabled.
 - Fix build issue which would cause media controls to disappear when
   Python 3.x was used during the build process.