a9436f1311
Refine commit 4885653014.
> I'm not sure whether gcc 3 is really the right test for whether the
> returns_nonnull attribute setting is available.
The gcc.gnu.org website only goes back to 5.1, and searching the
documentation of that version for returns_nonnull finds it. I used
ftp to get gcc-core-3.0.0 and gcc-core-4.0.0 and their doc files don't
mention this attribute. It might have been added for some later 4.x
but that really doesn't matter for nethack's purposes.
Use __GNUC__ >= 5 instead of __GNUC__ >= 3 when testing whether
__attribute__(returns_nonnull) is available.
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