mksh from shells project

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/shells/openSUSE_Tumbleweed/shells.repo
zypper refresh
zypper install mksh

需要 openSUSE Factory ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/shells/openSUSE_Factory/shells.repo
zypper refresh
zypper install mksh

需要 16.0 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/shells/16.0/shells.repo
zypper refresh
zypper install mksh

需要 15.6 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/shells/15.6/shells.repo
zypper refresh
zypper install mksh

需要 15.5 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/shells/15.5/shells.repo
zypper refresh
zypper install mksh

需要 SLE 12 SP1 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/shells/SLE_12_SP1/shells.repo
zypper refresh
zypper install mksh