Fix get_modified_time to avoid race condition on Windows

If multiple processes tried to read the same input file simultaneously,
get_modified_time would fail. With this change, get_modified_time
does not need to actually open the file in order to read the metadata.

src/base/application.cpp

@@ -36,7 +36,7 @@ static std::mutex xml_mutex;
 
 static int get_modified_time(const std::string& path) {
 #ifdef _WIN32
-    HANDLE hFile = CreateFile(path.c_str(), GENERIC_READ, FILE_SHARE_WRITE,
+    HANDLE hFile = CreateFile(path.c_str(), NULL, NULL,
                               NULL, OPEN_EXISTING, 0, NULL);
     if (hFile == INVALID_HANDLE_VALUE) {
         throw CanteraError("get_modified_time", "Couldn't open file:" + path);