package/jsoncpp: add hash

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/jsoncpp/jsoncpp.hash

@@ -0,0 +1,2 @@
+# Locally computed
+sha256	2179a7df19c1c6dc87e02c65b847efc914625a9b87df3e443d9610fc70c0f557	jsoncpp-1.7.2.tar.gz