Hide more Cryptlib symbols

src/sbbs3/sbbs.version

 SBBS {
 	local: BN_*;  # hide cryptlib BigNum functions, prevent collision with OpenSSL
+	local: CAST_*;  # hide cryptlib CAST functions, prevent collision with OpenSSL
+	local: EC_*;  # hide cryptlib EC functions, prevent collision with OpenSSL
+	local: SHA1_*;  # hide cryptlib SHA1 functions, prevent collision with OpenSSL
 };