abseil-cpp from home:mslacken:ml project

对于 openSUSE Factory ARM，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/openSUSE_Factory_ARM/home:mslacken:ml.repo
zypper refresh
zypper install abseil-cpp

对于 15.6，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/15.6/home:mslacken:ml.repo
zypper refresh
zypper install abseil-cpp

对于 15.5，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:mslacken:ml/15.5/home:mslacken:ml.repo
zypper refresh
zypper install abseil-cpp