Only apply hack if rlm_krb5 was compiled thread capable

src/modules/rlm_krb5/rlm_krb5.c

@@ -47,7 +47,7 @@ RCSID("$Id$")
  *  The functions sigs below are not provided by krb5.h, but are available
  *  in the library.
  */
-#if !defined(HEIMDAL_KRB5)
+#if !defined(HEIMDAL_KRB5) && KRB5_IS_THREAD_SAFE
 krb5_error_code
 krb5_set_default_in_tkt_ktypes(krb5_context context, const krb5_enctype *etypes);
 
@@ -259,6 +259,7 @@ static int krb5_instantiate(CONF_SECTION *conf, void *instance)
 	krb5_verify_init_creds_opt_init(inst->vic_options);
 	krb5_verify_init_creds_opt_set_ap_req_nofail(inst->vic_options, true);
 
+#  ifdef KRB5_IS_THREAD_SAFE
 	/*
 	 *	Explicitly set enctypes to work around bug in krb5_copy_context
 	 */
@@ -273,6 +274,7 @@ static int krb5_instantiate(CONF_SECTION *conf, void *instance)
 		krb5_set_default_tgs_ktypes(inst->context, enctypes);
 		krb5_free_ktypes(inst->context, enctypes);
 	}
+#  endif
 #endif
 
 	return 0;