The first release candidate with plenty of changes needs wider testing,
so package it.

Since Linux 4.8 new more efficient GPIO manipulation API is available
and sysfs class gpio is deprecated. Enable OpenOCD support for both for
now to avoid breaking existing user configs.

Due to low user demand and packaging difficulties require USB libraries
unconditionally from now on. Their sizes are not significant compared to
the OpenOCD package itself.

Signed-off-by: Paul Fertser <fercerpav@gmail.com>