Defining QT_OPENGL_ES_2 would only lead to conflicts with defines from
qconfig.h.
QT_OPENGL_ES_2_ANGLE also moves to the .pri.
QT_OPENGL_ES_2_ANGLE_STATIC is not used and is removed altogether.
Change-Id: I614fb00525ac696e066ac8328bb9bf61fca08a01
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>