xf86-input-synaptics: update 1.9.1 -> 1.9.2

Drop 64bit_time_t_support.patch as issue fixed upstream:
https://github.com/freedesktop/xorg-xf86-input-synaptics/commit/073b1b40bde9935928758c3452176c0d8dc67370



Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>