bug#59061: bwrap-related Emacs test failure on Ubuntu 22.10

[Paul Eggert <eggert@cs.ucla.edu>]

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This is on Ubuntu 22.10 x86-64, with current Emacs master (commit 
8a49a888532c955ae81855636a65b446508cb361 dated today). "make check" 
fails in some of the bubblewrap tests. Some bwrap expertise (which I 
don't have) would be of use in debugging this so I'm taking the liberty 
of cc'ing Philipp.

I'm attaching a copy of the build log (created with ./autogen.sh; 
configure; make; make check) and of the test failure logged in 
test/src/emacs-tests.log.

There are other test failures and if I get time I plan to file bug 
reports for them too.

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Running 7 tests (2022-11-05 12:11:07-0700, selector ‘(not (or (tag :expensive-test) (tag :unstable) (tag :nativecomp)))’)
Test emacs-tests/bwrap/allows-stdout backtrace:
  signal(ert-test-failed (((should (eql status 0)) :form (eql 159 0) :
  ert-fail(((should (eql status 0)) :form (eql 159 0) :value nil))
  #f(compiled-function () #<bytecode 0x1ba5192d57495e9f>)()
  ert--run-test-internal(#s(ert--test-execution-info :test #s(ert-test
  ert-run-test(#s(ert-test :name emacs-tests/bwrap/allows-stdout :docu
  ert-run-or-rerun-test(#s(ert--stats :selector (not (or ... ... ...))
  ert-run-tests((not (or (tag :expensive-test) (tag :unstable) (tag :n
  ert-run-tests-batch((not (or (tag :expensive-test) (tag :unstable) (
  ert-run-tests-batch-and-exit((not (or (tag :expensive-test) (tag :un
  eval((ert-run-tests-batch-and-exit '(not (or (tag :expensive-test) (
  command-line-1(("-L" ":." "-l" "ert" "-l" "src/emacs-tests" "--eval"
  command-line()
  normal-top-level()
Test emacs-tests/bwrap/allows-stdout condition:
    Info: Process output:
          
    (ert-test-failed
     ((should
       (eql status 0))
      :form
      (eql 159 0)
      :value nil))
   FAILED  1/7  emacs-tests/bwrap/allows-stdout (0.114432 sec) at src/emacs-tests.el:175
   passed  2/7  emacs-tests/seccomp/absent-file (0.015406 sec)
Test emacs-tests/seccomp/allows-stdout backtrace:
  signal(ert-test-failed (((should (eql status 0)) :form (eql "Bad sys
  ert-fail(((should (eql status 0)) :form (eql "Bad system call" 0) :v
  #f(compiled-function () #<bytecode -0xdcd8d3d483ef606>)()
  ert--run-test-internal(#s(ert--test-execution-info :test #s(ert-test
  ert-run-test(#s(ert-test :name emacs-tests/seccomp/allows-stdout :do
  ert-run-or-rerun-test(#s(ert--stats :selector (not (or ... ... ...))
  ert-run-tests((not (or (tag :expensive-test) (tag :unstable) (tag :n
  ert-run-tests-batch((not (or (tag :expensive-test) (tag :unstable) (
  ert-run-tests-batch-and-exit((not (or (tag :expensive-test) (tag :un
  eval((ert-run-tests-batch-and-exit '(not (or (tag :expensive-test) (
  command-line-1(("-L" ":." "-l" "ert" "-l" "src/emacs-tests" "--eval"
  command-line()
  normal-top-level()
Test emacs-tests/seccomp/allows-stdout condition:
    Info: Process output:
          
    (ert-test-failed
     ((should
       (eql status 0))
      :form
      (eql "Bad system call" 0)
      :value nil))
   FAILED  3/7  emacs-tests/seccomp/allows-stdout (0.111244 sec) at src/emacs-tests.el:122
   passed  4/7  emacs-tests/seccomp/empty-file (0.015778 sec)
   passed  5/7  emacs-tests/seccomp/file-too-large (0.031031 sec)
   passed  6/7  emacs-tests/seccomp/forbids-subprocess (0.111947 sec)
   passed  7/7  emacs-tests/seccomp/invalid-file-size (0.015693 sec)

Ran 7 tests, 5 results as expected, 2 unexpected (2022-11-05 12:11:07-0700, 0.512199 sec)

2 unexpected results:
   FAILED  emacs-tests/bwrap/allows-stdout
   FAILED  emacs-tests/seccomp/allows-stdout