Non-SFI Mode: Add nonsfi_loader and plumbing to test it

src/nonsfi/irt/irt_interfaces.h

Index: src/nonsfi/irt/irt_interfaces.h
diff --git a/src/nonsfi/irt/irt_interfaces.h b/src/nonsfi/irt/irt_interfaces.h
new file mode 100644
index 0000000000000000000000000000000000000000..686b9e7a86aa4f2bf59d4396e77f3e120ea2f47f
--- /dev/null
+++ b/src/nonsfi/irt/irt_interfaces.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2014 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef NATIVE_CLIENT_SRC_NONSFI_IRT_IRT_INTERFACES_H_
+#define NATIVE_CLIENT_SRC_NONSFI_IRT_IRT_INTERFACES_H_ 1
+
+typedef void (*nacl_entry_func_t)(void *args);
+
+int nacl_irt_nonsfi_entry(int argc, char **argv, char **environ,
+                          nacl_entry_func_t entry_func);
+
+#endif