systemd-experimental from devel:gcc:next:testing project

需要 devel gcc next openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/devel:gcc:next:testing/devel_gcc_next_openSUSE_Tumbleweed/devel:gcc:next:testing.repo
zypper refresh
zypper install systemd-experimental