src/backup.rs; use a macro to define PROXMOX_BACKUP_PROTOCOL_ID_V1

So that we can include it in static doc strings.

src/lib.rs

@@ -14,6 +14,7 @@ pub mod pxar;
 
 pub mod section_config;
 
+#[macro_use]
 pub mod backup;
 
 pub mod config;