Quiet -O1 -Wuninitialized warnings that all proved to be false alarms.
Tested by Alan W. Irwin <firstname.lastname@example.org> using the
install target. No uninitialized warnings occurred other than for
the remaining such warnings from the swig-generated bindings code
for Python, Lua, and Octave (but not for Java which may give a clue for
what to do for those other languages).