[SECURITY] Fedora 26 Update: gstreamer1-plugins-base-1.12.0-1.fc26

GStreamer is a streaming media framework, based on graphs of filters which operate on media data. Applications using this library can do anything from real-time sound processing to playing videos, and just about anything else media-related. Its plugin-based architecture means that new data types or processing capabilities can be added simply by installing new plug-ins. This package contains a set of well-maintained base plug-ins.