Update configure.in; support both baz and tla; avoid using dirent.
configure.in: Remove AC_PROG_RANLIB since we never use ranlib. Add
AC_PROG_LIBTOOL since we do use libtool. Set GNU_ARCH and
HAS_GNU_ARCH based on whether the system has baz or tla. Do not
check for dirent.d_type.
src/Makefile.am: Make the "checkversion" target conditional on
HAS_GNU_ARCH, and use the detected $(GNU_ARCH).
src/helpfile.c (language_read): Report error text when unable to open a
language directory.
(language_read_list): Always stat the language entry to determine
whether it is a directory; Cygwin has no dirent.d_type and ReiserFS
has a broken one.
git-archimport-id: srvx@srvx.net--2006/srvx--devo--1.3--patch-3