cxxtest: add hash for license file

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/cxxtest/cxxtest.hash

@@ -1,2 +1,5 @@
 # Locally computed:
 sha256	1c154fef91c65dbf1cd4519af7ade70a61d85a923b6e0c0b007dc7f4895cf7d8	cxxtest-4.4.tar.gz
+
+# Hash for license file:
+sha256 da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768  COPYING