Remove krb4 bits from mod_auth_kerb

diff --git a/mod_auth_kerb b/mod_auth_kerb
index dd40712..b700368 160000 (submodule)
--- a/mod_auth_kerb
+++ b/mod_auth_kerb
@@ -1 +1 @@
-Subproject commit dd40712d299763ab19cd522f50bd16c9d0d5915f
+Subproject commit b70036881312bfb5642710d4b7b8e4f65590b215