re: xsrc updates - some done, more to come

[matthew green <mrg%eterna.com.au@localhost>]

i meant to say -- you'll most likely see build issues if you do
not clean both your destdir *and* objdir for xsrc.

i've added a note to src/UPDATING about this, but i saw several
problems and eventually just gave up trying to do it piecemeal.


.mrg.