openocd: bump to version 0.8.0

openocd: bump to version 0.8.0

This patch adds the management of (almost) all the config options of
openocd 0.8.0. A BR config variable is added for (almost) every
adapter known to openocd and all the dependencies are automatically
calculated from the chosen adapters, so only the necessary libraries
are built.

Note that CMSIS_DAP adapter requires hidapi (not libhid) and hidapi is
not actually included in buildroot, so it has been removed.  Also
zy1000 adapters are actually broken in openocd and have been removed.

The host version of the package enables all the possible adapters and
the related libraries.

[Thomas:
 - Slightly fixup the commit log.
 - Rename the patches to the new patch naming convention.
 - Update hash file using a contribution from Vincent Stehlé.
 - Move the thread dependency from the OpenOCD option down to each
   sub-option that actually needs it (when it needs libusb,
   libusb-compat or libftdi). We keep only one comment, as we would
   otherwise have to add too many repeatitive comments.
 - Remove commented options.
 - Add missing dependency on BR2_ARCH_HAS_ATOMICS when selecting
   BR2_PACKAGE_LIBFTDI.
 - Remove trailing white spaces.
 - Pass -std=gnu99, needed to build with a basic toolchain.
 - Write the OPENOCD_DEPENDENCIES and OPENOCD_CONF_OPTS conditions in
   a more compact way.
 - Adjust indentation for HOST_OPENOCD_CONF_OPTS.
 - Reword the comment above HOST_OPENOCD_CONF_OPTS.]

Signed-off-by: Claudio Laurita <claudio.laurita@integrazionetotale.it>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>