core: Fix inconsistent override/virtual usage
authorManuel Nickschas <sputnick@quassel-irc.org>
Tue, 19 Dec 2017 20:28:46 +0000 (21:28 +0100)
committerManuel Nickschas <sputnick@quassel-irc.org>
Tue, 19 Dec 2017 21:40:27 +0000 (22:40 +0100)
Avoid compiler warnings due to this.

Closes GH-301.


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