libiio from home:wkazubski project

对于 16.0，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:wkazubski/16.0/home:wkazubski.repo
zypper refresh
zypper install libiio

对于 15.7，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:wkazubski/15.7/home:wkazubski.repo
zypper refresh
zypper install libiio

对于 15.6，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:wkazubski/15.6/home:wkazubski.repo
zypper refresh
zypper install libiio