[PATCH] fortran: Extend -fconvert= option for ppc64le r16_ieee and r16_ibm

[Thomas Koenig]

Hi Jakub,

> This patch on top of the previously posted option handling changes patch
> allows specifying -fconvert=swap,r16_ieee etc. (but will error on it
> when not on powerpc64le because in the library such swapping is only
> implemented for HAVE_REAL_17).
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

OK!

This is a much cleaner solution than what I had in mind, but didn't
start work on, which was to make the option into a string and parse
by hand.

Best regards

	Thomas