Base: Remove deprecated Py_GetPath call

Replace it with a piece of code that replicates the functionality. Also eliminate the round-trip through char * that this function was using (the final variable is stored as a std::string anyway).

src/App/Application.cpp

@@ -2635,8 +2635,8 @@ void Application::initConfig(int argc, char ** argv)
         Py_DECREF(pyModule);
     }
 
-    const char* pythonpath = Base::Interpreter().init(argc,argv);
-    if (pythonpath)
+    std::string pythonpath = Base::Interpreter().init(argc,argv);
+    if (!pythonpath.empty())
         mConfig["PythonSearchPath"] = pythonpath;
     else
         Base::Console().Warning("Encoding of Python paths failed\n");