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Break the longest-compiling file, imagebufalgo_mathops.cpp, into
imagebufalgo_addsub.cpp, imagebufalgo_muldiv.cpp, imagebufalgo_mad.cpp,
and a teensy bit of refactoring within those files to reduce compilation
effort.
Also changed the src/libOpenImageIO/CMakeLists.txt to list the most
expensive files first, in the hope that if it does that first, it can
load balance easier by having lots of inexpensive files to work on with
the other cores.
The net result is that it saves another 15 seconds of wall clock time
when building with 24 cores, down from about 2 minutes (so around another
12%).