[Patch RX] Added warnings of RX variants that does not have hardware FPU support

[DJ Delorie]

I've applied your patch.  However, I had to do it manually, as the
whitespace didn't match the source.  Please make sure you do "cvs
update" just before "cvs diff > some/file" to generate your patch.
Try to avoid using cut/paste to copy patches, as some terminal
emulators will do a tab-space conversion when you do that.

Thanks!