Move system_program out of src/

programs/native/noop/src/lib.rs

@@ -2,6 +2,7 @@
 extern crate solana_sdk;
 
 use solana_sdk::account::KeyedAccount;
+use solana_sdk::native_program::ProgramError;
 use solana_sdk::pubkey::Pubkey;
 
 solana_entrypoint!(entrypoint);
@@ -10,10 +11,10 @@ fn entrypoint(
     keyed_accounts: &mut [KeyedAccount],
     data: &[u8],
     tick_height: u64,
-) -> bool {
+) -> Result<(), ProgramError> {
     println!("noop: program_id: {:?}", program_id);
     println!("noop: keyed_accounts: {:#?}", keyed_accounts);
     println!("noop: data: {:?}", data);
     println!("noop: tick_height: {:?}", tick_height);
-    true
+    Ok(())
 }