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lgamma non-standard extension
we have a small compatible extension to lgamma, a standard C function.
we provide the sign of gamma(x) result in signgam, in a global.
we also have a reentry safe version, lgamma_r, where signgam is passed
as an argument.
because this is a standard C function, I assume the compiler is
completely free to replace it with a standard implementation, so using
our extension is unsafe even on netbsd.
i think it would be reasonable to get rid of the extension (modifying
signgam) in the next shlib major bump for this reason.
secondary: would we want to keep lgamma_r then?
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