Update documentation for AC_FC_LINE_LENGTH compiler switches.

[Ralf Wildenhues]

I'll push this along the other commits once approved.
(Rebasing and reordering the patches is a bit awkward,
as the patches introducing new macros all append to the
same file.)

Thanks,
Ralf

    Update documentation for AC_FC_LINE_LENGTH compiler switches.
    
    * lib/autoconf/fortran.m4 (AC_FC_LINE_LENGTH): Document NAGware
    switch.

diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index 416cf56..338c51d 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1308,6 +1308,7 @@ AC_LANG_POP([Fortran])dnl
 #                         132 free)
 #                   -wide: Lahey/Fujitsu Fortran (255 cols in fixed form)
 #                      -e: Sun Fortran compiler (132 characters)
+#                    -132: NAGWare
 AC_DEFUN_ONCE([AC_FC_LINE_LENGTH],
 [AC_LANG_PUSH([Fortran])dnl
 m4_case(m4_default([$1], [132]),