utils: use 'static inline' instead of 'inline static' for gtk-doc
utils: use 'static inline' instead of 'inline static' for gtk-doc

gtk-doc doesn't seem to recognise the former variant.

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer,centricular/gstreamer,centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer