Revert "egl/android: add missing include"

Revert "egl/android: add missing include"

This reverts commit 688d866eca8943f09cd846ffb045e18f6ec0677c.

The include I added in 688d866eca isn't actually useful, as it only
declares the opaque struct ANativeWindow.
However, this caused build issues for android-x86 [1] due to the header
being moved in Android O.

[1] https://lists.freedesktop.org/archives/mesa-dev/2017-August/167626.html

Fixes: 688d866eca8943f09cd8 "egl/android: add missing include"
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>