solana-program: Make frozen-abi optional (#1222)

* make frozen-abi optional in solana-program

* fix syntax error

* activate solana-program's frozen-abi feature in dev deps of program and sdk

* undo putting solana-program itself in solana-program dev deps

* add missing whitespace

Co-authored-by: Tyera <teulberg@gmail.com>

---------

Co-authored-by: Tyera <teulberg@gmail.com>

interface/src/instruction.rs

@@ -101,8 +101,12 @@ static_assertions::const_assert!(MAX_PERMITTED_DATA_LENGTH <= u32::MAX as u64);
 static_assertions::const_assert_eq!(MAX_PERMITTED_DATA_LENGTH, 10_485_760);
 
 /// An instruction to the system program.
-#[frozen_abi(digest = "5e22s2kFu9Do77hdcCyxyhuKHD8ThAB6Q6dNaLTCjL5M")]
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, AbiExample, AbiEnumVisitor)]
+#[cfg_attr(
+    feature = "frozen-abi",
+    frozen_abi(digest = "5e22s2kFu9Do77hdcCyxyhuKHD8ThAB6Q6dNaLTCjL5M"),
+    derive(AbiExample, AbiEnumVisitor)
+)]
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
 pub enum SystemInstruction {
     /// Create a new account
     ///