qmlgl: Fix conflicting declaration of type GLsync for non-android

https://bugzilla.gnome.org/show_bug.cgi?id=796821
diff --git a/ext/qt/gstqtgl.h b/ext/qt/gstqtgl.h
index 85aad62..1f204ab 100644
--- a/ext/qt/gstqtgl.h
+++ b/ext/qt/gstqtgl.h
@@ -29,7 +29,7 @@
 #include <QtGui/qtgui-config.h>
 #endif
 
-#if defined(QT_OPENGL_ES_2) && GST_GL_HAVE_WINDOW_ANDROID
+#if defined(QT_OPENGL_ES_2)
 #define GLsync gst_qt_GLsync
 #include <QOpenGLContext>
 #include <QOpenGLFunctions>