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

src/processor/minidump.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 26 matching lines @@
 
 #include <assert.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <string.h>
 #include <time.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 <fstream>
 #include <iostream>
 #include <limits>
 #include <map>
 #include <vector>
 
@@ skipping 4729 matching lines @@
     return NULL;
   }
 
   *stream = new_stream.release();
   info->stream = *stream;
   return *stream;
 }
 
 
 }  // namespace google_breakpad