WSDISPLAY_DEFAULTSCREENS or 0 if it's not defined) and use it instead
of WSDISPLAY_DEFAULTSCREENS as approptiate, so that number of screens
added on bootup is patchable
move printing of info about added screen into separate routine and
print just one message for all screens added in wsdisplay_common_attach(),
such as:
wsdisplay0: screen 1-7 added (80x25, vt100 emulation)
while here, do minor const poisoning
Reviewed by: drochner
Tested by: jdolecek
61cf56ebf2