[patch/rfc] constafy floatformat

[DJ Delorie]

> The attached changes the "from" parameter to the various floatformat 
> functions to a "const char *" / "const double *".

Ok.

> Baring comments I intend committing this one in a few hours.

Please do not check in unapproved patches to libiberty.

> To test the waters, I'm planning on following this up with a patch 
> proposing that this file be switched to ISO C.

No.  Libiberty cannot be converted to ISO C until *every* project that
uses it has been converted.  Libiberty will be the last conversion.