Fluid: remove special treatment for running Python code on windows

We discussed this in D7690 and could not find a reason for this
code anymore. It might just be leftover from some even older code.

intern/mantaflow/intern/MANTA_main.cpp

@@ -544,19 +544,7 @@ bool MANTA::runPythonString(std::vector<std::string> commands)
   PyGILState_STATE gilstate = PyGILState_Ensure();
   for (std::vector<std::string>::iterator it = commands.begin(); it != commands.end(); ++it) {
     std::string command = *it;
-
-#ifdef WIN32
-    // special treatment for windows when running python code
-    size_t cmdLength = command.length();
-    char *buffer = new char[cmdLength + 1];
-    memcpy(buffer, command.data(), cmdLength);
-
-    buffer[cmdLength] = '\0';
-    success = PyRun_SimpleString(buffer);
-    delete[] buffer;
-#else
     success = PyRun_SimpleString(command.c_str());
-#endif
   }
   PyGILState_Release(gilstate);