[CMAKE] Disable OpenGL in Qt static build for OSX
A bug in the CMake files distributed by Qt prevent building with static
OpenGL on OSX (hard linked dependency to the framework in the Qt5Gui
dependencies). To workaround the issue, the static Qt is built without
the OpenGL support.
This fixes the bitcoin-qt cross build for OSX.
mkdir buildcmake && cd buildcmake cmake -GNinja -DCMAKE_TOOLCHAIN_FILE=../cmake/platforms/OSX.cmake .. ninja
Run the generated src/qt/bitcoin-qt on OSX >= 10.8 (tested on OSX Sierra
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D3034