Fix Mac Breakpad host tools to build in Linux cross-compile

src/third_party/mac_headers/architecture/byte_order.h

+/*
+ * Copyright (c) 1999-2008 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1992 NeXT Computer, Inc.
+ *
+ * Byte ordering conversion.
+ *
+ */
+/* This file mostly left blank */
+
+#ifndef _ARCHITECTURE_BYTE_ORDER_H_
+#define _ARCHITECTURE_BYTE_ORDER_H_
+
+/*
+ * Identify the byte order
+ * of the current host.
+ */
+
+enum NXByteOrder {
+    NX_UnknownByteOrder,
+    NX_LittleEndian,
+    NX_BigEndian
+};
+
+#endif  /* _ARCHITECTURE_BYTE_ORDER_H_ */