Report stated a -Wformat-nonliteral at line 612,
and a -Wformat-security at line 614
I was only seeing the latter, so I added the former to the
flags in sys/unix/hints/include/compiler.370. Some compiler
versions have that warning on by default internally and others
don't. If the format string isn't a string literal, there's no
inteference with printf argument checking because that only
operates on string literals.
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