Support for MQRFH2

[sj010203]

MQRFH2 support can be added to this?
Don't see in existing stuff.

[ibmmqmet]

By coincidence, I was already adding an RFH2 processor for something else I was working on. It's in today's v5.6.1 release.

But for most applications, it's much easier to use the Message Properties functions (MQCRTMH, MQSETMP etc) instead. The qmgr automatically converts between RFH2 and properties, so explicitly handling an RFH2 is not usually required.