This comes from http://archive.apache.org/dist/incubator/log4net/1.2.10/incubating-log4net-1.2.10.zip:bin/net/2.0/release/log4net.dll
OpenSimulator currently ships this version, but this means that in some circumstances libomv fails to load the logger DLL.
Since the DLL containing the publickeytoken is arguably superior (since it identifies the library as coming from apache)
I'm proposing replacement of the existing DLL in libomv which has an unrecorded origin (possibly self compiled).