Ceph no longer builds for s390x after Beast submodule enabled
https://github.com/ceph/ceph/pull/14273 introduces a regression in that it breaks the s390x build.
The immediate cause of the build failure is this line: https://github.com/ceph/ceph/blob/5b41fb55e40833de55e1d93e0be07c6da319a8bb/CMakeLists.txt#L511
I.e. the introduction of "context" as a required Boost component.
The build fails on find_package(Boost . . .) with the following message:
[ 228s] CMake Error at /usr/share/cmake/Modules/FindBoost.cmake:1657 (message): [ 228s] Unable to find the requested Boost libraries. [ 228s] [ 228s] Boost version: 1.63.0 [ 228s] [ 228s] Boost include path: [ 228s] /home/abuild/rpmbuild/BUILD/ceph-12.0.3+git.1495491843.99463ac8f3/build/boost/include [ 228s] [ 228s] [ 228s] Could not find the following static Boost libraries: [ 228s] [ 228s] boost_context [ 228s] [ 228s] Some (but not all) of the required Boost libraries were found. You may [ 228s] need to install these additional Boost libraries. Alternatively, set [ 228s] BOOST_LIBRARYDIR to the directory containing Boost libraries or BOOST_ROOT [ 228s] to the location of Boost. [ 228s] Call Stack (most recent call first): [ 228s] CMakeLists.txt:595 (find_package)