[PATCH] PAM user map plugin does not work with LDAP groups

Originally seem here: https://mariadb.com/comment/286#comment-286

"Does not work with pam_ldap.so and group membership
Try the fixed version here:
github.com/raffis/mariadb-pam_user_map"

The attached patch is a diff of this:

https://github.com/MariaDB/server/blob/b0935fc5dafbd4a6c9adeeec4647a9616abf4b7b/plugin/auth_pam/mapper/pam_user_map.c

And this:

https://github.com/raffis/mariadb-pam_user_map/blob/ed93e0ad5bb469019b831c0a6ffa6189f1cf0d94/pam_user_map.c