gstreamer-devtools from multimedia:libs project

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/multimedia:libs/openSUSE_Tumbleweed/multimedia:libs.repo
zypper refresh
zypper install gstreamer-devtools

需要 openSUSE Factory PowerPC ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/multimedia:libs/openSUSE_Factory_PowerPC/multimedia:libs.repo
zypper refresh
zypper install gstreamer-devtools

需要 openSUSE Factory ARM ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/multimedia:libs/openSUSE_Factory_ARM/multimedia:libs.repo
zypper refresh
zypper install gstreamer-devtools

需要 15.6 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/multimedia:libs/15.6/multimedia:libs.repo
zypper refresh
zypper install gstreamer-devtools

需要 15.5 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/multimedia:libs/15.5/multimedia:libs.repo
zypper refresh
zypper install gstreamer-devtools

需要 Backports SLE-15-SP5 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/multimedia:libs/Backports_SLE-15-SP5/multimedia:libs.repo
zypper refresh
zypper install gstreamer-devtools