Lua: can't emu.keypost() a line feed character

[shattered]

https://github.com/mamedev/mame/blame/master/src/emu/ioport.cpp#L895 forcibly converts all line feeds to carriage returns. Console in the driver I'm working assigns different meaning to either of these.

[cracyc]

Not sure of the best way to deal with this. @mmicko should look at it.

[mmicko]

Sorry, on vacation now so can't check, but it looks idea was to unify input from any osd OS, and most computers do have just CR and no LF key, so guess there is a problem.