proxmox-sys: fix glob-import of anyhow

will break usage of the `Result::Ok()' with anyhow 1.0.49+ as that
added a new Ok helper, so a glob-import would make that shadow the
core one.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

proxmox-sys/src/linux/mod.rs

@@ -1,6 +1,6 @@
 //! Linux specific helpers and syscall wrapper
 
-use anyhow::*;
+use anyhow::{bail,Error};
 
 use proxmox_io::vec;