Add some const decorations

One of these functions is new in PostgreSQL 14; might as well start it
out right.

src/backend/replication/logical/origin.c

@@ -206,7 +206,7 @@ replorigin_check_prerequisites(bool check_slots, bool recoveryOK)
  * Returns InvalidOid if the node isn't known yet and missing_ok is true.
  */
 RepOriginId
-replorigin_by_name(char *roname, bool missing_ok)
+replorigin_by_name(const char *roname, bool missing_ok)
 {
 	Form_pg_replication_origin ident;
 	Oid			roident = InvalidOid;
@@ -237,7 +237,7 @@ replorigin_by_name(char *roname, bool missing_ok)
  * Needs to be called in a transaction.
  */
 RepOriginId
-replorigin_create(char *roname)
+replorigin_create(const char *roname)
 {
 	Oid			roident;
 	HeapTuple	tuple = NULL;
@@ -411,7 +411,7 @@ restart:
  * Needs to be called in a transaction.
  */
 void
-replorigin_drop_by_name(char *name, bool missing_ok, bool nowait)
+replorigin_drop_by_name(const char *name, bool missing_ok, bool nowait)
 {
 	RepOriginId roident;
 	Relation	rel;

src/include/replication/origin.h

@@ -38,9 +38,9 @@ extern PGDLLIMPORT XLogRecPtr replorigin_session_origin_lsn;
 extern PGDLLIMPORT TimestampTz replorigin_session_origin_timestamp;
 
 /* API for querying & manipulating replication origins */
-extern RepOriginId replorigin_by_name(char *name, bool missing_ok);
-extern RepOriginId replorigin_create(char *name);
-extern void replorigin_drop_by_name(char *name, bool missing_ok, bool nowait);
+extern RepOriginId replorigin_by_name(const char *name, bool missing_ok);
+extern RepOriginId replorigin_create(const char *name);
+extern void replorigin_drop_by_name(const char *name, bool missing_ok, bool nowait);
 extern bool replorigin_by_oid(RepOriginId roident, bool missing_ok,
 							  char **roname);