Don't use strtok_s for mingw builds

src/processor/cfi_frame_info.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 25 matching lines @@
 
 #include <string.h>
 
 #include <sstream>
 
 #include "common/scoped_ptr.h"
 #include "processor/postfix_evaluator-inl.h"
 
 namespace google_breakpad {
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #define strtok_r strtok_s
 #endif
 
 template<typename V>
 bool CFIFrameInfo::FindCallerRegs(const RegisterValueMap<V> &registers,
                                   const MemoryRegion &memory,
                                   RegisterValueMap<V> *caller_registers) const {
   // If there are not rules for both .ra and .cfa in effect at this address,
   // don't use this CFI data for stack walking.
   if (cfa_rule_.empty() || ra_rule_.empty())
@@ skipping 120 matching lines @@
 void CFIFrameInfoParseHandler::RARule(const string &expression) {
   frame_info_->SetRARule(expression);
 }
 
 void CFIFrameInfoParseHandler::RegisterRule(const string &name,
                                             const string &expression) {
   frame_info_->SetRegisterRule(name, expression);
 }
 
 } // namespace google_breakpad