REORG: include: move auth.h to haproxy/auth{,-t}.h

The STATS_DEFAULT_REALM and STATS_DEFAULT_URI were moved to defaults.h.
It was required to include types/pattern.h and types/sample.h since they
are mentioned in function prototypes.

It would be wise to merge this with uri_auth.h later.
diff --git a/src/acl.c b/src/acl.c
index 5b5fd1d..1ecacb1 100644
--- a/src/acl.c
+++ b/src/acl.c
@@ -14,6 +14,7 @@
 #include <stdio.h>
 #include <string.h>
 
+#include <haproxy/auth.h>
 #include <haproxy/api.h>
 #include <haproxy/list.h>
 #include <haproxy/tools.h>
@@ -23,7 +24,6 @@
 
 #include <proto/acl.h>
 #include <haproxy/arg.h>
-#include <proto/auth.h>
 #include <proto/channel.h>
 #include <proto/log.h>
 #include <proto/pattern.h>