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Use the "official" FindOpenImageIO.cmake from OIIO (recently
added). This necessitates some renaming, for example standard use of
OPENIMAGEIO_ROOT_DIR.
Change inconsistent naming of OSLHOME (and OSL_HOME) to the more
standard OSL_ROOT_DIR.
Copy updated FindOpenEXR.cmake from recent OIIO (and related changes).
Eliminate all of testsuite/MaterialX, which was not used, never fully
worked, and was certainly out of date with our MX support. If we want
to add unit tests for MX shaders, I think I will take a completely
different approach. So for now, just eliminate the clutter.
Eliminate site/pixar/Makefile-bits, which they say they no longer use
(some of those customizations were the very last uses of some weird
custom stuff in our older FindOpenEXR.cmake, now eliminated).