vbo: signal _NEW_ARRAY when transitioning between glBegin/End, glDrawArrays

vbo: signal _NEW_ARRAY when transitioning between glBegin/End, glDrawArrays

This fixes a regression seen with the isosurf demo when switching between
glBegin/End and glDrawArrays (do it several times).  The problem was the
driver wasn't getting _NEW_ARRAY when the arrays were subtly changed:
(vertex3f, normal3f) vs. (normal3f, vertex3f).

This patch fixes that by signaling _NEW_ARRAY whenever we transition
between glBegin/End and glDrawArrays mode and display lists.

The patch also fixes up the initialization of the map_vp_none[] array
to stop putting strange values in the last five elements of the array.

v2: remove DRAW_ELEMENTS, don't distinguish between glDrawArrays and
glDrawElements

v3: add DRAW_DISPLAY_LIST for the display list case, just to be safe.

Reviewed-by: Mathias Froehlich <Mathias.Froehlich@web.de>
Tested-by: Mathias Froehlich <Mathias.Froehlich@web.de>