Bug 571536 - Remove obsolete USE_DOUBLE_BUFFER=true in BufferedCanvas

This used to be a platform specific setting, but move to a constant
which can be removed.

Change-Id: I303e3beeae03a30d57a0065fb3f5e648f2f91bef
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
1 file changed