Fix fatal bug in the last commit: restore setting argc

Initialization of wxApp::argc was mistakenly removed, breaking the code
iterating over wxApp::argv from 0 to it.

See https://github.com/wxWidgets/wxWidgets/pull/462

src/common/init.cpp

@@ -335,6 +335,7 @@ bool wxEntryStart(int& argc, wxChar **argv)
 
     // remember, possibly modified (e.g. due to removal of toolkit-specific
     // parameters), command line arguments in member variables
+    app->argc = argc;
     app->argv.Init(argc, argv);
 
     wxCallAppCleanup callAppCleanup(app.get());