Constify ldif_open() args

include/ldif.h

@@ -90,7 +90,7 @@ typedef struct LDIFFP {
 } LDIFFP;
 
 LDAP_LDIF_F( LDIFFP * )
-ldif_open LDAP_P(( char *file, char *mode ));
+ldif_open LDAP_P(( LDAP_CONST char *file, LDAP_CONST char *mode ));
 
 LDAP_LDIF_F( void )
 ldif_close LDAP_P(( LDIFFP * ));

libraries/liblutil/ldif.c

@@ -747,8 +747,8 @@ int ldif_is_not_printable(
 
 LDIFFP *
 ldif_open(
-	char *file,
-	char *mode
+	LDAP_CONST char *file,
+	LDAP_CONST char *mode
 )
 {
 	FILE *fp = fopen( file, mode );