- Document frexpf(). - Neither frexp() nor frexpf() set errno. - Although frexp() is in libc for backwards compatibility, frexpf() is   in its proper place in libm.  Document both as being in libm. - The frexp() and frexpf() functions conform to C99.
- Document frexpf().
- Neither frexp() nor frexpf() set errno.
- Although frexp() is in libc for backwards compatibility, frexpf() is
  in its proper place in libm.  Document both as being in libm.
- The frexp() and frexpf() functions conform to C99.

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