package/libdrm: bump version to 2.4.62

Added support for newly added optional valgrind support:
http://cgit.freedesktop.org/mesa/drm/commit/?id=47a2de27a0f087908e3063fdd6dfdececd2db75b



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>