cxxtools from server:http project

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

zypper addrepo https://download.opensuse.org/repositories/server:http/openSUSE_Tumbleweed/server:http.repo
zypper refresh
zypper install cxxtools

对于 16.0，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:http/16.0/server:http.repo
zypper refresh
zypper install cxxtools

对于 15.7，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:http/15.7/server:http.repo
zypper refresh
zypper install cxxtools

对于 15.6，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/server:http/15.6/server:http.repo
zypper refresh
zypper install cxxtools