waf: compiler flags, uninitalized variable

[Hal Murray]

devel at ntpsec.org said:
> Usually, you won't get that type of warning unless you enable it.  And
> usually, you only get that type of warning in an optimized compile, since
>  the dataflow analysis needed to detect it is part of the optimization
> code. 

I tried O3.  That found a different maybe-uninitialized.

I tried O6.  Nothing new.


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