f2c configure fix

[Dave Love]

>>>>> "KRG" == Kaveh R Ghazi <ghazi@caip.rutgers.edu> writes:

 KRG> 	There's a problem with whatever got checked in today.  It
 KRG> shows itself on systems with complex multilibs like Irix6 (and
 KRG> possibly others) that nest multilib combinations in deeper
 KRG> directory levels.

Bother, yes, that figures.  (I guess it was actually not doing the
right thing before but it had no sanity check.)  Sorry I can't attend
to it right now.