XXX: Avoid rebuilding coreutils.info; our makeinfo is too old

Index: Makefile.in
--- Makefile.in.orig
+++ Makefile.in
@@ -21087,6 +21087,7 @@ doc/$(am__dirstamp):
 	@: > doc/$(am__dirstamp)
 
 $(srcdir)/doc/coreutils.info: doc/coreutils.texi $(srcdir)/doc/version.texi $(doc_coreutils_TEXINFOS)
+	exit 0 && \
 	$(AM_V_MAKEINFO)restore=: && backupdir="$(am__leading_dot)am$$$$" && \
 	am__cwd=`pwd` && $(am__cd) $(srcdir) && \
 	rm -rf $$backupdir && mkdir $$backupdir && \