- Document ldexpf(). - Although ldexp() is in libc for backwards compatibility, ldexpf() is   in its proper place in libm.  Document both as being in libm. - The ldexp() and ldexpf() functions conform to C99.
- Document ldexpf().
- Although ldexp() is in libc for backwards compatibility, ldexpf() is
  in its proper place in libm.  Document both as being in libm.
- The ldexp() and ldexpf() functions conform to C99.

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