The splash image is included from an xpm file since we cannot
use the application data directories before having setup all
the standard directories, so we cannot dynamically load a file.

Note that gimp and krita create xpm's that give lots of compile
warnings, so after changing the splash image, we need to add
a bunch of consts:

turn

static char * splash_screen_xpm[]={

ito

static const char * const splash_screen_xpm[]={