update rls submodule to bring a few fixes in

pietroalbini · pietroalbini · commit f9df6bb798de · 2018-12-17T12:10:01.000+01:00
diff --git a/src/tools/rls b/src/tools/rls
@@ -1 +1 @@
-Subproject commit 66105269f3457fca4aad21577636047872d74fcb
+Subproject commit b379ef76a1e3ab5cbc7e0010e2751f992fa3b62a
