Do not hard code values of directories in `configure.in'.

Update the `configure' tool chain.

* configure.in (XPFILE, XPFILE1, LOCALEDIR): Remove, handled by
src/makefile.am.
(VERSION_STRING): Use the third arg of AC_DEFINE_UNQUOTED.
(AC_OUTPUT): Add m4/Makefile.
Bump to bison 1.28a, 1.29 has never been released.
* acconfig.h (XPFILE, XPFILE1, LOCALEDIR): Remove, since they are
handled via src/Makefile.am.
(VERSION_STRING, PROTOTYPES, ENABLE_NLS, HAVE_CATGETS,
HAVE_GETTEXT, HAVE_LC_MESSAGES, HAVE_STPCPY): Remove, handled by
autoheader.
* Makefile.am (SUBDIRS): Add m4.
(ACLOCAL_AM_FLAGS): New variable.
(AUTOMAKE_OPTIONS): Add check-news.
* src/Makefile.am (bison.simple): Use awk to replace #line lines with
the proper line number and file name.
(DEFS): Propagate the location of bison library files and of the
locale files.
(INCLUDES): Added `-I ..' so that one can compile with srcdir !=
builddir.
* acinclude.m4: Remove, replaced by the directory m4.
* m4/Makefile.am (EXTRA_DIST): New variable.
* m4/gettext.m4: New file, from the fileutils.
* m4/lcmessage.m4: Likewise
* m4/progtest.m4: Likewise.
* m4/bison-decl.m4: New file, extracted from former acinclude.m4.

configure.in

@@ -1,8 +1,10 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_INIT(src/reduce.c)
-AM_INIT_AUTOMAKE(bison,1.29)
-AM_CONFIG_HEADER(config.h:config.hin)
 AC_PREREQ(2.13)
+AC_INIT(src/reduce.c)
+AM_INIT_AUTOMAKE(bison, 1.28a)
+AM_CONFIG_HEADER(config.h:config.hin)
+AC_DEFINE_UNQUOTED(VERSION_STRING, "GNU Bison version ${VERSION}",
+                   [The version string.])
 
 ALL_LINGUAS="de es fr nl ru"
 
@@ -39,12 +41,6 @@ AM_GNU_GETTEXT
 # the ANSI2KNR-filtering rules.
 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
 
-AC_DEFINE_UNQUOTED(VERSION_STRING, "GNU Bison version ${VERSION}")
-XPFILE="${datadir}/bison.simple"
-BISON_DEFINE_FILE(XPFILE, XPFILE)
-XPFILE1="${datadir}/bison.hairy"
-BISON_DEFINE_FILE(XPFILE1, XPFILE1)
-LOCALEDIR="${datadir}/locale"
-BISON_DEFINE_FILE(LOCALEDIR, LOCALEDIR)
-
-AC_OUTPUT(Makefile intl/Makefile po/Makefile.in src/Makefile doc/Makefile)
+AC_OUTPUT([Makefile
+           intl/Makefile po/Makefile.in
+           src/Makefile doc/Makefile m4/Makefile])