Subzero: Fix "make presubmit" for spec -Om1.
For the Om1 spec tests, we were generating commands like this:
./pydir/szbuild_spec2k.py -v -Om1 --target=x8632 -O2 --filetype=obj 253.perlbmk
where -Om1 and -O2 both appear. Python's argparse allows an argument to be set multiple times, and the last one would win, i.e. -O2 is used instead of -Om1.
BUG= none
R=jpp@chromium.org
Review URL: https://codereview.chromium.org/1766603002 .
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