Remove linux/keyctl.h

* linux/keyctl.h: Remove.
* Makefile.am (EXTRA_DIST): Remove it.
* keyctl.c: Do not include <linux/keyctl.h>.
* xlat/key_perms.in: Add default values.
* xlat/key_reqkeys.in: Likewise.
* xlat/key_spec.in: Likewise.
* xlat/keyctl_commands.in: Likewise.
diff --git a/xlat/key_spec.in b/xlat/key_spec.in
index 942b7ef..3e87954 100644
--- a/xlat/key_spec.in
+++ b/xlat/key_spec.in
@@ -1,8 +1,8 @@
-KEY_SPEC_THREAD_KEYRING
-KEY_SPEC_PROCESS_KEYRING
-KEY_SPEC_SESSION_KEYRING
-KEY_SPEC_USER_KEYRING
-KEY_SPEC_USER_SESSION_KEYRING
-KEY_SPEC_GROUP_KEYRING
-KEY_SPEC_REQKEY_AUTH_KEY
-KEY_SPEC_REQUESTOR_KEYRING
+KEY_SPEC_THREAD_KEYRING -1
+KEY_SPEC_PROCESS_KEYRING -2
+KEY_SPEC_SESSION_KEYRING -3
+KEY_SPEC_USER_KEYRING -4
+KEY_SPEC_USER_SESSION_KEYRING -5
+KEY_SPEC_GROUP_KEYRING -6
+KEY_SPEC_REQKEY_AUTH_KEY -7
+KEY_SPEC_REQUESTOR_KEYRING -8