Stop unconditional synth of mouse events on Android

Before this patch we always send mouse events for each
touch event that happens.
This is redundant (we already synthesize in
QGuiApplicatioin) and breaks some touch handling
in QtQuick2.

Change-Id: I4bc1686a7a46039901315619a0acdf2888ad6775
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Add workaround for GL on Android emulator

On the Android Emulator, the shaders will be compiled by a desktop
GL driver, since the GL driver in the emulator is just a thin
wrapper. The GL driver does not necessarily support the precision
qualifiers, which can cause applications to break. We detect this
at runtime in the platform plugin and set a workaround flag to

Task-number: QTBUG-32557
Change-Id: Ied00cfe8e804d1f7862697dd379a14f3bed3d980
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>