Update audio/soundkonverter to 2.0.91.

Changes:
 * Add cdrkit as an optional ripper dependency
 * Switch to using Github (old source no longer updated)

Changelog:

new in 2.0.91 (2.1.0 rc2):
 -Add: Full GUI support for album artist tags
       including the CD ripper
 -Add: Chinese translation
 -Change: Replace uses of fixed pixel metrics with
          sizes based on the default font size
 -Fix: CD ripper layout

new in 2.0.90 (2.1.0 rc1):
 -Add: Hide main window when started with
       --replaygain argument
 -Add: Option to eject CD after ripping has been
       completed (enabled by default)
 -Add: New space holder for the "meta data" naming
       mode that contains the source directory
 -Add: Configuration options for cdparanoia
 -Add: icedax ripper plugin
 -Add: Copy album artist tags
 -Change: Remember last folder for add
          files/directory/playlist dialogs
 -Change: Add symlinked files to file list

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