Fix MSVC build (including on 2015), drop some workarounds for MSVC older than 2013.

src/processor/dump_context.cc

 // 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.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 //
 // See dump_context.h for documentation.
 
 #include "google_breakpad/processor/dump_context.h"
 
 #include <assert.h>
 #include <stdio.h>
 
 #ifdef _WIN32
 #include <io.h>
-#define PRIx64 "llx"
-#define PRIx32 "lx"
+#if defined(_MSC_VER) && _MSC_VER < 1900
 #define snprintf _snprintf
+#endif
 #else  // _WIN32
 #include <unistd.h>
 #endif  // _WIN32
 
 #include "processor/logging.h"
 
 namespace google_breakpad {
 
 DumpContext::DumpContext() : context_(),
                              context_flags_(0) { }
@@ skipping 594 matching lines @@
       break;
     }
 
     default: {
       break;
     }
   }
 }
 
 }  // namespace google_breakpad