rrdtool: add hash

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rrdtool/rrdtool.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256	3190efea410a6dd035799717948b2df09910f608d72d23ee81adad4cd0184ae9	rrdtool-1.2.30.tar.gz