libmtp: update to 1.1.15.
libmtp: update to 1.1.15.

Closes #12897.

Signed-off-by: Enno Boland <00f63b104cc192f7f01eceab27b343d9965c9f26@voidlinux.eu>

necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages,coredumb/void-packages,NeoChontrix/void-packages,coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,coredumb/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages