Comment 8 for bug 885802

> to allow us to *not* have to use the extern "C"

class epicsThread already accomplishes this in a more c++ friendly way, though epicsRunnable is a bit awkward.
Rather than adding a new (C-like) function, how about another constructor for class epicsThread? (a la. epics::pvData::Thread).

https://github.com/epics-base/pvDataCPP/blob/a1c0e432ee605c8abaa8f34185503c2886e12545/src/misc/pv/thread.h#L185