Add flag to disable double buffering

Some devices don't support double buffering, so add
the flag TW_DISABLE_DOUBLE_BUFFERING to disable it

Change-Id: Ia9c233fa229ae9c221a6c6f219b216d1753052f4
diff --git a/minuitwrp/Android.mk b/minuitwrp/Android.mk
index f429744..188de9d 100644
--- a/minuitwrp/Android.mk
+++ b/minuitwrp/Android.mk
@@ -52,6 +52,10 @@
 LOCAL_CFLAGS += -DRECOVERY_GRAPHICS_USE_LINELENGTH
 endif
 
+ifeq ($(TW_DISABLE_DOUBLE_BUFFERING), true)
+LOCAL_CFLAGS += -DTW_DISABLE_DOUBLE_BUFFERING
+endif
+
 #Remove the # from the line below to enable event logging
 #TWRP_EVENT_LOGGING := true
 ifeq ($(TWRP_EVENT_LOGGING), true)