Bug#673772: asynchronous transfer of control with delay abort and syscalls not working

[Nicolas Boulenguez]

Package: gnat-5
Followup-For: Bug #673772
Control: tag -1 upstream wontfix

Quoting upstream:
Actually Ada does not make any guarantee when mixing ATC and system calls and
indeed, it is fundamentally unsafe if not impossible to properly abort from any
random system call, so this isn't supported.