- Do not exit with status 99. It is considered a "hard failure"
in Autotest, and cleanup script won't be executed.
- Fix ATX_FEAT_PREREQ().
- Remove unneeded helper macros.
- Add more log output.
This is meant to be a workaround for a limitation of Autotest,
where `set -e` has no effect in AT_CHECK().
Also we don't want to use `trap ... ERR`, since it is not portable.
- The initial `impl_rearm()` should always be performed by the
worker thread, so that we won't get spurious zero returns from
`watcher_poll()`.
- Sandboxing should not be implicitly disabled if not implemented.
- Shift internal watcher flags, to save space for public ones
if we wish to add any in the future.
- Address sanitizer may call sigaltstack().
Add it to the syscall whitelist (debug only).
- Fix args count checking for `check-bookmarkfs-util watcher`.
