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

src/common/stabs_reader.h

 // -*- mode: c++ -*-
 
 // Copyright (c) 2010 Google Inc. 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.
@@ skipping 35 matching lines @@
 #ifndef COMMON_STABS_READER_H__
 #define COMMON_STABS_READER_H__
 
 #include <stddef.h>
 #include <stdint.h>
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
 
-#ifdef HAVE_A_OUT_H
-#include <a.out.h>
-#endif
 #ifdef HAVE_MACH_O_NLIST_H
 #include <mach-o/nlist.h>
+#elif defined(HAVE_A_OUT_H)
+#include <a.out.h>
 #endif
 
 #include <string>
 #include <vector>
 
 #include "common/byte_cursor.h"
 #include "common/using_std_string.h"
 
 namespace google_breakpad {
 
@@ skipping 246 matching lines @@
   }
 
   // Report a warning.  FORMAT is a printf-like format string,
   // specifying how to format the subsequent arguments.
   virtual void Warning(const char *format, ...) = 0;
 };
 
 } // namespace google_breakpad
 
 #endif  // COMMON_STABS_READER_H__