vmm: allow to call fcntl in debug

This fixes a issue of running vm compiled in debug with Rust
1.80.0 or later, where this check was introduced.

Signed-off-by: Wenyu Huang <huangwenyuu@outlook.com>

virtio-devices/src/seccomp_filters.rs

@@ -270,6 +270,8 @@ fn virtio_thread_common() -> Vec<(i64, Vec<SeccompRule>)> {
         (libc::SYS_rt_sigreturn, vec![]),
         (libc::SYS_sigaltstack, vec![]),
         (libc::SYS_write, vec![]),
+        #[cfg(debug_assertions)]
+        (libc::SYS_fcntl, vec![]),
     ]
 }