(install-arch-indep): Don't die if site-lisp/ isn't writable.

Makefile.in

@@ -346,14 +346,14 @@ install-arch-indep: mkdir
 	    > ${datadir}/emacs/${version}/site-lisp/subdirs.el; \
 	fi
 	chmod a+r ${datadir}/emacs/${version}/site-lisp/subdirs.el
-	if [ -f ${datadir}/emacs/site-lisp/subdirs.el ]; \
+	-if [ -f ${datadir}/emacs/site-lisp/subdirs.el ]; \
 	then true; \
 	else \
 	  (echo "(if (fboundp 'normal-top-level-add-subdirs-to-load-path)"; \
 	   echo "    (normal-top-level-add-subdirs-to-load-path))") \
 	    > ${datadir}/emacs/site-lisp/subdirs.el; \
 	fi
-	chmod a+r ${datadir}/emacs/site-lisp/subdirs.el
+	-chmod a+r ${datadir}/emacs/site-lisp/subdirs.el
 	if [ `(cd ./etc; /bin/pwd)` != `(cd ${docdir}; /bin/pwd)` ]; \
 	then \
 	   echo "Copying etc/DOC-* to ${docdir} ..." ; \