tools/check-hash.sh: Add shasum to use checking hash

In macOS, sha*sum tools not found, but shasum can be use instead of them.

tools/check-hash.sh

@@ -71,7 +71,14 @@ esac
 
 # Calculate hash value of passed file
 
-calc_hash=$( ${hash_algo}sum "${file_to_check}" | cut -d' ' -f1 )
+if [ `which ${hash_algo}sum 2> /dev/null` ]; then
+    hash_algo_cmd="${hash_algo}sum"
+elif [ `which shasum 2> /dev/null` ]; then
+    hash_algo_len=$( echo ${hash_algo} | cut -c 4- )
+    hash_algo_cmd="shasum -a ${hash_algo_len}"
+fi
+
+calc_hash=$( ${hash_algo_cmd} "${file_to_check}" | cut -d' ' -f1 )
 
 # Does it match expected hash?