fix for detecting fortran libraries on Darwin

[Andreas Waechter]

Hi,

Autoconf 2.59 doesn't seem to handle the detection of fortran libraries
correctly on newer Darwin (MacOS) systems.  Typical error message is

checking for Fortran libraries of f77...  -lcrt2.o
-L/finkinstalled/lib/gcc/powerpc-apple-darwin7.0.0/3.4
-L/finkinstalled/lib/gcc/powerpc-apple-darwin7.0.0/3.4/../../..
-lfrtbegin -lg2c -lSystem
checking for dummy main to link with Fortran libraries... unknown
configure: error: linking to Fortran libraries from C fails

Problem is that '-lcrt2.o' is thought to be part of the fortran libraries.

I seem to have fixed it by changing line 650 in lib/autoconf/fortran.m4
from

<         -lang* | -lcrt[[01]].o | -lcrtbegin.o | -lc | -lgcc | -libmil | 
-LANG:=*)

to

>         -lang* | -lcrt[[012]].o | -lcrtbegin.o | -lc | -lgcc | -libmil | 
> -LANG:=*)

This seems also to be the cause for the failure reported in

http://mail.gnu.org/archive/html/bug-autoconf/2003-12/msg00090.html

Hope this helps.

Andreas