The variable MaikoGitVersion will contain a git revision from the head of the source tree
along with an indication if the status was "dirty". If git is not present on the system
or the directory that the build happened in was not under git control the version will be
"none".
* Pedantic C compilers want an extern declaration separate from initialization
* Remove duplicate definitions for fns in initdspdefs.h from display.h
* Remove misleading comments on structure member offsets and reorder to minimize padding
