nlsr: Update to the latest version

Change-Id: I2077a89b565b97812685202788e8db69c4512cff
diff --git a/nlsr/debian/patches/series b/nlsr/debian/patches/series
new file mode 100644
index 0000000..661c3d7
--- /dev/null
+++ b/nlsr/debian/patches/series
@@ -0,0 +1 @@
+downgrade-sphinx.patch