Hijack SDL2 and GLEW include and library when compiling to javascript
emscripten already provides the SDL2 suite and will simply ignore
missing libraries.
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}