Remove config.rpath from EXTRA_DIST

The config.rpath script was added by running gettextize, but it's not
really needed, as config.rpath is generated by autotools and it's
included in the dist tarball automatically.

Upstream gettextize has been fixed so it does not happen any more:
http://savannah.gnu.org/bugs/index.php?48729

Makefile.am

@@ -22,7 +22,6 @@ EXTRA_DIST +=			\
 	sanitize-la.sh		\
 	po/README.translators	\
 	po/po2tbl.sed.in	\
-	build-aux/config.rpath	\
 	make-pot
 
 MAINTAINERCLEANFILES = \