Position independent wrapper.

* tests/bison: Remove.
* tests/bison.in: New.
* configure.in: Adjust.

Makefile.in

@@ -292,7 +292,7 @@ distdir: $(DISTFILES)
 	fi
 	-chmod -R a+w $(distdir) >/dev/null 2>&1; rm -rf $(distdir)
 	mkdir $(distdir)
-	$(mkinstalldirs) $(distdir)/intl $(distdir)/po
+	$(mkinstalldirs) $(distdir)/intl $(distdir)/po $(distdir)/tests
 	@for file in $(DISTFILES); do \
 	  if test -f $$file; then d=.; else d=$(srcdir); fi; \
 	  dir=`echo "$$file" | sed -e 's,/[^/]*$$,,'`; \