some tests fail on linux/aarch32

Hello I tried building on arm 32-bit and I can successfully build tor on NixOS when skipping the tests. However with the tests enabled the build fails.

This is the output from build logs:

` # sandbox/is_active: [forking] Feb 06 17:43:14.224 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:146: assert(sandbox_is_active())
  #   [is_active FAILED]
  # sandbox/open_filename: [forking] Feb 06 17:43:14.279 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:170: assert(fd OP_EQ -1): 9 vs -1
  #   [open_filename FAILED]
  # sandbox/opendir_dirname: [forking] Feb 06 17:43:14.343 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:271: assert(dir OP_EQ NULL): 0xdf8300 vs (nil)
  #   [opendir_dirname FAILED]
  # sandbox/openat_filename: [forking] Feb 06 17:43:14.400 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:249: assert(fd OP_EQ -1): 9 vs -1
  #   [openat_filename FAILED]
  # sandbox/chmod_filename: [forking] Feb 06 17:43:14.493 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:190: assert(rc OP_EQ -1): 0 vs -1
  #   [chmod_filename FAILED]
  # sandbox/chown_filename: [forking] Feb 06 17:43:14.561 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:208: assert(rc OP_EQ -1): 0 vs -1
  #   [chown_filename FAILED]
  # sandbox/rename_filename: [forking] Feb 06 17:43:14.629 [err] install_syscall_filter(): Bug: (Sandbox) failed to load: -125 (Operation canceled)! Are you sure that your kernel has seccomp2 support? The sandbox won't work without it. (on Tor 0.4.8.10 )
  #   FAIL src/test/test_sandbox.c:228: assert(rc OP_EQ -1): 0 vs -1
  #   [rename_filename FAILED]`

The NixOS build script can be found here: https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/security/tor/default.nix

I already submitted a PR which disables the tests for linux/aarch32 (https://github.com/NixOS/nixpkgs/pull/286792/files) but ideally would be to have the fix upstream.