D12120: Check if the application androiddeployqt package has a main() symbol

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: Frameworks, Build System.
Restricted Application added projects: Frameworks, Build System.
apol requested review of this revision.

REVISION SUMMARY
  Back in the KDE Edu sprint, we decided we need such a check, otherwise
  you get rather frustrated when the application isn't started. A patch to
  androiddeployqt was submitted but rejected by the maintainer.
  https://codereview.qt-project.org/#/c/207941/

TEST PLAN
  kate doesn't build if we don't pass Q_DECL_EXPORT, builds if we do.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12120

AFFECTED FILES
  toolchain/Android.cmake
  toolchain/hasMainSymbol.cmake

To: apol, #frameworks, #build_system
Cc: michaelh, ngraham, bruns
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