Merge bitcoin/bitcoin#33791: kernel: Use enumeration type for flags argument

ed57205 kernel: Use enumeration type for flags argument (TheCharlatan)

Pull request description:

  Just a small followup from bitcoin/bitcoin#30595 (comment).

ACKs for top commit:
  alexanderwiederin:
    ACK bitcoin/bitcoin@ed57205
  rkrux:
    lgtm ACK ed57205 as per the mentioned review comment of the previous PR.
  stickies-v:
    ACK ed57205

Tree-SHA512: f365d86c76b88b7730c4182192f8fbacc536121de367d03f27450087b39d13bb0cc21ca5ede9428077ccf5be90e959e892d7d383c8a2900b7bfd2864dde37466

Author: fanquake

src/kernel/bitcoinkernel.h

@@ -386,7 +386,7 @@ typedef struct {
     btck_NotifyWarningSet warning_set;      //!< A warning issued by the kernel library during validation.
     btck_NotifyWarningUnset warning_unset;  //!< A previous condition leading to the issuance of a warning is no longer given.
     btck_NotifyFlushError flush_error;      //!< An error encountered when flushing data to disk.
-    btck_NotifyFatalError fatal_error;      //!< A un-recoverable system error encountered by the library.
+    btck_NotifyFatalError fatal_error;      //!< An unrecoverable system error encountered by the library.
 } btck_NotificationInterfaceCallbacks;
 
 /**
@@ -608,7 +608,7 @@ BITCOINKERNEL_API int BITCOINKERNEL_WARN_UNUSED_RESULT btck_script_pubkey_verify
     const btck_Transaction* tx_to,
     const btck_TransactionOutput** spent_outputs, size_t spent_outputs_len,
     unsigned int input_index,
-    unsigned int flags,
+    btck_ScriptVerificationFlags flags,
     btck_ScriptVerifyStatus* status) BITCOINKERNEL_ARG_NONNULL(1, 3);
 
 /**