package/libplist: Bump version to 1.12

Quoting http://cgit.sukimashita.com/libplist.git/tree/NEWS


"  * Fix parallel build for autotools"

Therefore removed MAKE1, tested with -j90

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>