Compilation problem ModuleMixim.xx

[aarizaq]

ModuleMixim needs omnet 6.4 (watchBase)

It should be necessary to change
#if OMNETPP_VERSION < 0x0602

error At least OMNeT++/OMNEST version 6.2 required

#endif

to

#if OMNETPP_VERSION < 0x0604

error At least OMNeT++/OMNEST version 6.4 required

#endif