Processed: Raise severity of libgnome-keyring reverse depends bugs

[Debian Bug Tracking System]

Processing control commands:

> severity -1 serious
Bug #867937 [src:mate-power-manager] mate-power-manager: Build-Depends on deprecated libgnome-keyring-dev
Severity set to 'serious' from 'important'

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867937: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=867937
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