sispmctl: new package

[Thomas:
 - Add missing select of BR2_PACKAGE_LIBUSB, since
   BR2_PACKAGE_LIBUSB_COMPAT depends on it
 - Add missing thread dependency, since libusb requires threads.
 - Add missing wide-char dependency. Without wide char support,
   sispmctl doesn't build.
 - Rewrap the Config.in help text, and remove trailing whitespaces.
 - License is GPLv2+, not GPLv2.
 - Remove --disable-dependency-tracking from <pkg>_CONF_OPT. That's a
   global, standard, autoconf option, and there's no reason to pass it
   at the per-package level.]

Signed-off-by: Phil Eichinger <phil@zankapfel.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>