Added system flag DISABLE_FIX_FOR_559965 that allows temporarily "undo"
the fix for bug 559965. If the flag is set to true, the fix for bug
559965 is disabled.

Change-Id: Idb5e515af30dfe857fc450aae4b7839669fbcf77
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>