fix mbtk-rootfs build error.

Change-Id: I80e935b468066c1c2befb3bf6340ed32725ddb25
diff --git a/package/mbtk-rootfs/Makefile b/package/mbtk-rootfs/Makefile
index 01c14ea..6a420d5 100755
--- a/package/mbtk-rootfs/Makefile
+++ b/package/mbtk-rootfs/Makefile
@@ -34,7 +34,8 @@
 
 define Package/$(PKG_NAME)/extra_provides
     echo "libdnet.so.1"; \
-	echo "cfg80211.ko";
+	echo "cfg80211.ko"; \
+	echo "libhttpclient.so";
 endef
 
 define Package/mbtk-rootfs/description