AI 143632: am: CL 143504 Completed cstddef to be non empty and similar to the gnu stl implementation.

Even if we don't want to have a bloated stl implementation, having empty
  files around is probably not very good either.
  Added a test to make sure the header file compiles on host and kila-eng.
  QA Impact: In system/extras/test/bionic/libstdc++ build the tests using:
  mm BIONIC_TESTS=1
  to build the host and target tests.
  Original author: niko
  Merged from: //branches/donutburger/...

Automated import of CL 143632

libstdc++/include/cstddef

@@ -0,0 +1,46 @@
+/* -*- c++ -*- */
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef BIONIC_LIBSTDCPP_INCLUDE_CSTDDEF__
+#define BIONIC_LIBSTDCPP_INCLUDE_CSTDDEF__
+
+/*
+ * Standard C++ Library wrapper around the C stddef.h header file.
+ * The following 2 types are also declared in the 'std' namespace:
+ *   . ptrdiff_t
+ *   . size_t
+ */
+#include <stddef.h>
+
+namespace std {
+    using ::ptrdiff_t;
+    using ::size_t;
+}  // namespace std
+
+#endif  // BIONIC_LIBSTDCPP_INCLUDE_CSTDDEF__