Add missing GL includes in WASM compositor

IDEs (vscode) have problems with missing includes.

Change-Id: I2618aaaf79c81a2c3566682e13caf31133ece631
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/plugins/platforms/wasm/qwasmcompositor.cpp

@@ -8,6 +8,7 @@
 #include "qwasmclipboard.h"
 #include "qwasmevent.h"
 
+#include <QtOpenGL/qopenglpixeltransferoptions.h>
 #include <QtOpenGL/qopengltexture.h>
 
 #include <QtGui/private/qwindow_p.h>
@@ -24,6 +25,8 @@
 
 #include <emscripten/bind.h>
 
+#include <GL/gl.h>
+
 namespace {
 QWasmWindow *asWasmWindow(QWindow *window)
 {