I'm not a huge fan of testing for warnings by hijacking the logging
routines, but right now there's no way to exfiltrate warnings from Aul
any other way, so it'll have to do.
Overriding the logging functions from C4SimpleLog.cpp has the nice
additional advantage that expected runtime errors no longer get written
to stdout - this is okay because we're already checking that an
exception is thrown.
Nicolas Hake