document fortran.m4 commit

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+2003-10-03  Steven G. Johnson  <stevenj@alum.mit.edu>
+
+       * lib/autoconf/fortran.m4 (AC_PROG_FC): Reverse the order of the
+       arguments so that it can be used with syntax identical to
+       AC_PROG_F77, and so that we can more easily decide to
+       remove/deprecate the DIALECT optional argument in the future if it
+       proves troublesome.
+       (AC_FC_FREEFORM): Exit 77 upon failure to fix test suite for
+       non-freeform-supporting compilers.  Document freeform flags.
+
 2003-10-03  Akim Demaille  <akim@epita.fr>
 
        * configure.ac: Look for emacs, not macs.