autoconf 2.13 does not recognize the correct executable extension

[Ralf Fassel]

IRIX 6.5, autoconf 2.13
The tclodc packages uses the following construct in configure.in:

    #--------------------------------------------------------------------
    # Determines the correct binary file extension (.o, .obj, .exe etc.)
    #--------------------------------------------------------------------

    AC_LANG_SAVE
    AC_LANG_CPLUSPLUS
    AC_OBJEXT
    AC_EXEEXT
    AC_LANG_RESTORE

Using autoconf 2.13, this expands to the following sh code:

    #--------------------------------------------------------------------
    # Determines the correct binary file extension (.o, .obj, .exe etc.)
    #--------------------------------------------------------------------
    ac_ext=C
--<snip-snip>--
    echo "configure:1251: checking for executable suffix" >&5
--<snip-snip>--
        for file in conftest.*; do
          case $file in
          *.c | *.o | *.obj) ;;
          *) ac_cv_exeext=`echo $file | sed -e s/conftest//` ;;
          esac
        done

which results in the executable suffix being set to `.C' since $ac_ext
is not included in the `case' switch.

This should better expand to something like

        for file in conftest.*; do
          case $file in
!          # include $ac_ext here:
!          *.c | *.o | *.obj | *.$ac_ext) ;;
          *) ac_cv_exeext=`echo $file | sed -e s/conftest//` ;;
          esac
        done

Regards
R'
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