split minijail0 cli parsers into a sep module

This will let us unittest them easily.  The only thing this CL has done
is move all the non-main funcs from minijail0.c to minijail0_cli.c.

Bug: None
Test: `make check` passes
Change-Id: I2be5cf2097d1f8d15270595f5200c872a0a551c4
diff --git a/minijail0_cli.h b/minijail0_cli.h
new file mode 100644
index 0000000..d4eb440
--- /dev/null
+++ b/minijail0_cli.h
@@ -0,0 +1,26 @@
+/* Copyright 2018 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Helpers for the minijail0 program.  Split out for unittesting.
+ */
+
+#ifndef MINIJAIL_MINIJAIL0_CLI_H_
+#define MINIJAIL_MINIJAIL0_CLI_H_
+
+#include "elfparse.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct minijail;
+
+int parse_args(struct minijail *j, int argc, char * const argv[],
+	       int *exit_immediately, ElfType *elftype);
+
+#ifdef __cplusplus
+}; /* extern "C" */
+#endif
+
+#endif  /* MINIJAIL_MINIJAIL0_CLI_H_ */