heimdal: Add missing function prototypes

This fixes the build with GCC 14 on stable/14 which raises fatal
-Wimplicit-function-declaration warnings.

Reviewed by:	rmacklem, cy
Fixes:		5000d023a4 ("heimdal-kadmin: Add support for the -f dump option")
Differential Revision:	https://reviews.freebsd.org/D54931

crypto/heimdal/lib/hdb/hdb-private.h

@@ -24,6 +24,12 @@ _hdb_keytab2hdb_entry (
 	const krb5_keytab_entry */*ktentry*/,
 	hdb_entry_ex */*entry*/);
 
+int
+_hdb_mit_dump2mitdb_entry(
+	krb5_context /*context*/,
+	char */*line*/,
+	krb5_storage */*sp*/);
+
 int
 _hdb_mkey_decrypt (
 	krb5_context /*context*/,
@@ -51,6 +57,12 @@ _hdb_remove (
 	HDB */*db*/,
 	krb5_const_principal /*principal*/);
 
+krb5_error_code
+_hdb_set_master_key_usage (
+	krb5_context /*context*/,
+	HDB */*db*/,
+	unsigned int /*key_usage*/);
+
 krb5_error_code
 _hdb_store (
 	krb5_context /*context*/,