whoops. forgot conditional #if statement for builds that lack the
dynamic core.

Patch origin (Gulikoza):

http://bocke.na.rs/distfiles/dosbox-x-git20140520-linux64.patch
remove unused variable in the SDL gui. Update DOSBox copyright date to
reflect that we're now halfway through 2014.
remove unused LOG_MSG from keyboard.cpp. remove extra variables from
LOG_MSG calls that didn't use them (GCC compiler warning about printf).