Fix build of gstreamer and gstreamer1 with glib 2.38.x [1].
Update gstreamer and gstreamer-plugins to new rules, USES=gmake pathfix,
new LIB_DEPENDS syntax.
Only pull in flex if base version is too old.
Be more selective for which OSVERSIONS we need gcc due to the clang bug.
Obtained from: Gstreamer upstream [1]
Update Gstreamer-plugins-good to 0.10.27
Update Gstreamer-plugins-bad to 0.10.21
Update Gstreamer-plugins-ugly to 0.10.17
Add flite plugin. plugin for the flite Speech synthesis engine.
Add opencv plugin. plugin for opencv Computer vision library.
Move vdpau plugin to a beter category.
Remove LOCAL master sites that haven't been updated for ages.
Check if Gstreamer (core) is recent enough.
Remove 6.x BROKEN line for the bad plugin.
