build: fix 9562a77... (mrlg removal)

mrlg.cgi was removed in 9562a77 "mrlg: Remove obsolete version." but the
file was still listed in Makefile.am.

Fixes: 9562a77 ("mrlg: Remove obsolete version.")
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/Makefile.am b/Makefile.am
index 6916470..b608253 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,7 +11,7 @@
 EXTRA_DIST = aclocal.m4 SERVICES TODO REPORTING-BUGS INSTALL.quagga.txt \
 	update-autotools \
 	vtysh/Makefile.in vtysh/Makefile.am \
-	tools/mrlg.cgi tools/rrcheck.pl tools/rrlookup.pl tools/zc.pl \
+	tools/rrcheck.pl tools/rrlookup.pl tools/zc.pl \
 	tools/zebra.el tools/multiple-bgpd.sh \
 	fpm/fpm.h