Define HAVE_ for math long double functions declared in vxworks headers

[Alexandre Oliva]

On Jan 22, 2020, Jonathan Wakely <jwakely@redhat.com> wrote:

> Isn't allowing arithmetic on function pointers a GNU extension?

Does that matter?  This test is only supposed to be compiled by GCC.


> I think just adding the #undef to what you had originally is the best
> version.

'k, thanks, will adjust, test, post and install.

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