Re: Flattening config_files

[Akim Demaille]

| ChangeLog:
|         * acgeneral.m4 (AC_CONFIG_FILES): Add files to ac_config_files
|         using AC_FOREACH to ensure that it's flat and has no extra spaces.
| 
| ___________________
| --- acgeneral.m4
| +++ acgeneral.m4
| @@ -3690,7 +3690,8 @@
|  ])])])
|  _AC_CONFIG_COMMANDS_INIT([$3])
|  m4_divert_pop()dnl
| -ac_config_files="$ac_config_files $1"
| +ac_config_files="$ac_config_files[]AC_FOREACH([AC_File],
| +                                           [$1], [ AC_File])"
|  ])dnl
| 
|  # Initialize the lists.
| ___________________

The idea is fine, but I think the implementation is too hacky.  Use
this instead:

        m4_strip(m4_flatten([$1]))

See them in M4sugar.