Properly destroy the cairo context when we're done with it

Henrik reports that on OSX, not destroying the cairo context results in
a corrupted profile display.  It seems to just leak memory on Linux.

For gtk3, the cairo context is embedded in the GtkDrawable, for gtk2 we
need to create and destroy it appropriately.  Although maybe we could
just make it static instead of creating/destroying it all the time.

Anyway, this goes back to the old cairo destroy logic for gtk2.

Reported-and-analyzed-by: Henrik Brautaset Aronsen <subsurface@henrik.synth.no>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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