Processed: gnubg: Remove libcanberra (sound support)

[Debian Bug Tracking System]

Processing control commands:

> block 967569 by -1
Bug #967569 [src:libcanberra] libcanberra: depends on deprecated GTK 2
967569 was not blocked by any bugs.
967569 was blocking: 947713
Added blocking bug(s) of 967569: 1036381

-- 
1036381: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1036381
967569: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=967569
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