Robert Bragg dd8e4dcd62 [debug] Guard the use of gdk_pixbuf for pick debugging by #ifdef USE_GDKPIXBUF
gdk is an optional clutter dependency, so the pick buffer debugging option
needs some guards so we don't break, for example, the OSX builds.  This also
adds a comment for the bit fiddling done on the pick colors used to ensure
the pick colors are more distinguished while debugging.  (we swap the
nibbles of each color component so that pick buffers don't just look black.)
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