package/openobex: bump version to 1.7.2

Package switched to cmake without providing most of the autoconf
options previously available. Therefore we move all suboptions to
Config.in.legacy.

All patches are removed, the files to be patched do not exist anymore.

OPENOBEX_EXTRACT_CMDS is not needed anymore, upstream provides the
source as .tar.gz now.

Version 1.6 added support for libusb-1.x and udev. The current version
also supports bluez5_utils, not only bluez_utils.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Arnout: add help text to legacy options]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>