Fail to build from source with gcc-10

Hi,
In Debian Sid we get a bug in the compiling with gcc-10.
The build log is attached.

The Debian Bug Report is https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=957043

[bitz-server.build.log](https://github.com/uditha-atukorala/bitz-server/files/4987699/bitz-server.build.log)

CU
Jörg