Fix LDAP ticket policies on big-endian LP64

Fix LDAP ticket policies on big-endian LP64

krb5_ldap_get_value() takes a pointer to int, and should not be passed
a pointer to any integral type which might have a different width.
Use an intermediate variable for each call.

The erroneous calls in ldap_misc.c were passing pointers to int32_t,
which is harmless on all common platforms.  The calls in
ldap_tkt_policy.c were passing pointers to long; on big-endian LP64
platforms, the result would be written to the high 32 bits of the long
value.

ticket: 8166
target_version: 1.13.2
tags: pullup