restrict AC_CONFIG_LIBOBJ_DIR

[Stepan Kasal]

Hello,
  AC_CONFIG_LIBOBJ_DIR contains m4_bmatch call which ensures
that the dir name doesn't start with

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789

which is not much probable, indeed.  :-)

This was an obvious mistake; but it's not so clear how a good solution
should look like.

One possible solutions is in the patch attached to this mail.

(I made this patch last week, but I presented it in an unrelated thread.
So I repost it here, with proper explanation.)

Have a nice day,
        Stepan Kasal

autoconf-20050420-libobj_dir.patch
Description: Text document