D8173: Use readelf to find project dependencies

[Aleix Pol Gonzalez]

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

REVISION SUMMARY
  We were using a link.txt file that cmake used to generate, on newer cmake
  versions it doesn't anymore.
  Instead use readelf, much like androiddeployqt does, to extract the
  depenencies.
  Catch: It relies on having all the binaries being at the same subdirectory,
  which is the default in ECM since not long ago.

TEST PLAN
  Build kirigamigallery with it

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8173

AFFECTED FILES
  tests/CMakeLists.txt
  tests/ECMToolchainAndroidTest/CMakeLists.txt
  tests/ECMToolchainAndroidTest/main.c
  tests/ECMToolchainAndroidTest/testlinkfile/CMakeFiles/testtarget.dir/link.txt
  tests/ECMToolchainAndroidTest/testlinkfile/outputfake.json
  toolchain/Android.cmake
  toolchain/specifydependencies.cmake

To: apol, #frameworks, #build_system
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