Add BPF support & C-based BPF tic-tac-toe (#1422)

Add initial support for BPF and a C port of tictactoe

programs/noop/src/lib.rs

@@ -1,6 +0,0 @@
-extern crate solana_program_interface;
-
-use solana_program_interface::account::KeyedAccount;
-
-#[no_mangle]
-pub extern "C" fn process(_infos: &mut Vec<KeyedAccount>, _data: &[u8]) {}