Revert "Remove feature switch for secp256k1 program (#18467)"

This reverts commit fd574dcb3b.

runtime/src/builtins.rs

@@ -3,6 +3,7 @@ use crate::{
     system_instruction_processor,
 };
 use solana_sdk::{
+    feature_set,
     instruction::InstructionError,
     process_instruction::{stable_log, InvokeContext, ProcessInstructionWithContext},
     pubkey::Pubkey,
@@ -63,11 +64,6 @@ fn genesis_builtins() -> Vec<Builtin> {
             solana_config_program::id(),
             with_program_logging!(solana_config_program::config_processor::process_instruction),
         ),
-        Builtin::new(
-            "secp256k1_program",
-            solana_sdk::secp256k1_program::id(),
-            solana_secp256k1_program::process_instruction,
-        ),
     ]
 }
 
@@ -86,7 +82,15 @@ pub enum ActivationType {
 /// normal child Bank creation.
 /// https://github.com/solana-labs/solana/blob/84b139cc94b5be7c9e0c18c2ad91743231b85a0d/runtime/src/bank.rs#L1723
 fn feature_builtins() -> Vec<(Builtin, Pubkey, ActivationType)> {
-    vec![]
+    vec![(
+        Builtin::new(
+            "secp256k1_program",
+            solana_sdk::secp256k1_program::id(),
+            solana_secp256k1_program::process_instruction,
+        ),
+        feature_set::secp256k1_program_enabled::id(),
+        ActivationType::NewProgram,
+    )]
 }
 
 pub(crate) fn get() -> Builtins {