While experimenting with some warning flags I found another one which breaks
the perl headers. This warning is triggered by code like this:
void bla();
void bla();
Sadly, the perl headers do this for some weird reason :(
git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1427 726aef4b-f618-498e-8847-2d620e286838