fix plugins.multiauth for AIX

mysql-test/suite/plugins/t/multiauth.test

@@ -186,7 +186,8 @@ eval $dreplace, mysqltest1;
 create user mysqltest1 identified via ed25519 as password("good");
 show create user mysqltest1;
 --echo # no plugin = failure
---replace_regex /loaded: .*client_ed25519.so: cannot open shared object file: No such file or directory/loaded: no such file/ /loaded: Cannot open.*client_ed25519.so./loaded: no such file/ /loaded: .*Could not load module.*directory/loaded: no such file/
+# covers Linux (1st re), FreeBSD (2nd), AIX (3rd and 4th)
+--replace_regex /loaded: .*client_ed25519.so: cannot open shared object file: No such file or directory/loaded: no such file/ /loaded: Cannot open.*client_ed25519.so./loaded: no such file/ /loaded: .*Could not load module.*client_ed25519.so.\n/loaded: no such file/ /System error: No such file or directory//
 --error 1
 --exec $try_auth -u mysqltest1 -pgood --plugin-dir=$plugindir/no
 alter user mysqltest1 identified via ed25519 as password("good") OR mysql_native_password as password("works");