Add build flag for forcing single buffer mode

RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER := true

Change-Id: Id5144ea772c3b7ae382b064c41c23acdd0decb84
diff --git a/minuitwrp/Android.mk b/minuitwrp/Android.mk
index 1894372..5124666 100644
--- a/minuitwrp/Android.mk
+++ b/minuitwrp/Android.mk
@@ -80,8 +80,8 @@
 LOCAL_CFLAGS += -DRECOVERY_GRAPHICS_FORCE_USE_LINELENGTH
 endif
 
-ifeq ($(TW_DISABLE_DOUBLE_BUFFERING), true)
-LOCAL_CFLAGS += -DTW_DISABLE_DOUBLE_BUFFERING
+ifeq ($(RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER), true)
+LOCAL_CFLAGS += -DRECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER
 endif
 
 #Remove the # from the line below to enable event logging