fe03f7a37fd0ef05149161f6b95a25493e1fe38f

Opensuse tumbleweed

Steps to reproduce:

```
./test/functional/wallet_backup.py --descriptors
#if defined(USE_SYSCALL_SANDBOX)
    if (!g_syscall_sandbox_enabled) {
        return;
    }
    SeccompPolicyBuilder seccomp_policy_builder;
    switch (syscall_policy) {
    case SyscallSandboxPolicy::INITIALIZATION: 
        
        
        
        
        
        
        
        seccomp_policy_builder.AllowFileSystem();
        seccomp_policy_builder.AllowNetwork();
        break;
    case SyscallSandboxPolicy::INITIALIZATION_DNS_SEED: 
        seccomp_policy_builder.AllowFileSystem();
        seccomp_policy_builder.AllowNetwork();
        break;
    case SyscallSandboxPolicy::INITIALIZATION_LOAD_BLOCKS: 
        seccomp_policy_builder.AllowFileSystem();
        break;
    case SyscallSandboxPolicy::INITIALIZATION_MAP_PORT: 
        seccomp_policy_builder.AllowFileSystem();
        seccomp_policy_builder.AllowNetwork();
        break;
    case SyscallSandboxPolicy::MESSAGE_HANDLER: 
        seccomp_policy_builder.AllowFileSystem();