package/cmake: add hash for license file

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/cmake/cmake.hash

@@ -1,2 +1,5 @@
 # From http://www.cmake.org/files/v3.8/cmake-3.8.2-SHA-256.txt
 sha256 da3072794eb4c09f2d782fcee043847b99bb4cf8d4573978d9b2024214d6e92d  cmake-3.8.2.tar.gz
+
+# Locally calculated
+sha256 af3030e1bf1af2f534430fdfe3cfc5a617966648a2a7f0c06a631adc92be1e5f  Copyright.txt