[patch, fortran] Fix PR 33683, wrong gamma function

[Thomas Koenig]

On Sun, 2007-10-07 at 13:50 -0700, Jerry DeLisle wrote:

> Yes, commit now so that we can identify the other platforms that do
> not have 
> tgamma, then deal with those.

Committed as rev.  129116.

Thanks!
	Thomas