maint: use *.texi.

This is more consistent with the other packages, and Automake-NG
supports only *.texi.

* doc/bison.texinfo: Rename as...
* doc/bison.texi: this.
* doc/Makefile.am, examples/calc++/Makefile.am: Adjust.

doc/Makefile.am

@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AM_MAKEINFOFLAGS = --no-split
-info_TEXINFOS = bison.texinfo
+info_TEXINFOS = bison.texi
 bison_TEXINFOS = $(srcdir)/cross-options.texi gpl-3.0.texi fdl.texi
 
 CLEANFILES = bison.fns

examples/calc++/Makefile.am

@@ -28,7 +28,7 @@ $(BISON): $(BISON_IN)
 ## Extracting.  ##
 ## ------------ ##
 
-doc = $(top_srcdir)/doc/bison.texinfo
+doc = $(top_srcdir)/doc/bison.texi
 extexi = $(top_srcdir)/examples/extexi
 # Extract in src.
 $(srcdir)/calc.stamp: $(doc) $(extexi)
@@ -36,7 +36,7 @@ $(srcdir)/calc.stamp: $(doc) $(extexi)
 	$(AM_V_at)touch $@.tmp
 	$(AM_V_at)cd $(srcdir) && \
 	   $(AWK) -f ../extexi -v VERSION="$(VERSION)" \
-	     ../../doc/bison.texinfo -- calc++-parser.yy \
+	     ../../doc/bison.texi -- calc++-parser.yy \
 	     calc++-scanner.ll calc++.cc calc++-driver.hh calc++-driver.cc
 	$(AM_V_at)mv $@.tmp $@