Don't use strtok_s for mingw builds

src/processor/basic_source_line_resolver.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 38 matching lines @@
 
 #include "processor/tokenize.h"
 
 using std::map;
 using std::vector;
 using std::make_pair;
 
 namespace google_breakpad {
 
 #ifdef _WIN32
+#ifdef _MSC_VER
 #define strtok_r strtok_s
+#endif
 #define strtoull _strtoui64
 #endif
 
 static const char *kWhitespace = " \r\n";
 static const int kMaxErrorsPrinted = 5;
 static const int kMaxErrorsBeforeBailing = 100;
 
 BasicSourceLineResolver::BasicSourceLineResolver() :
     SourceLineResolverBase(new BasicModuleFactory) { }
 
@@ skipping 530 matching lines @@
 
 // static
 bool SymbolParseHelper::IsValidAfterNumber(char *after_number) {
   if (after_number != NULL && strchr(kWhitespace, *after_number) != NULL) {
     return true;
   }
   return false;
 }
 
 }  // namespace google_breakpad