features.h in wip-rtl

[Noah Lavine]

Hello,

I've hit a problem building a recent wip-rtl. It now includes the file
libguile/elf.h, which does "#include <features.h>". I'm building Guile
on Mac OS X, and I think that doesn't have features.h, so the build
breaks. However, I don't see any uses of feature.h in elf.h - in
particular, there aren't any ifdef's. Can we take out that inclusion?

Thanks,
Noah