Revert "Android: Add -DQT_OPENGL_FORCE_SHADER_DEFINES to configure"

Adding this to the build actually breaks Qt on Android devices.

This reverts commit 25c31feced7540b83c016770b2be25958c49fd12.

Task-number: QTBUG-32625
Change-Id: I8ed409d079047c4faea62a33936df7472b33a4cf
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>