rustbuild: support setting verbosity in config.toml

Signed-off-by: Marc-Antoine Perennou <[email protected]>

Author: Keruspe

src/bootstrap/config.rs

@@ -148,6 +148,7 @@ struct Build {
     python: Option<String>,
     full_bootstrap: Option<bool>,
     extended: Option<bool>,
+    verbose: Option<usize>,
 }
 
 /// TOML representation of various global install decisions.
@@ -292,6 +293,7 @@ impl Config {
         set(&mut config.vendor, build.vendor);
         set(&mut config.full_bootstrap, build.full_bootstrap);
         set(&mut config.extended, build.extended);
+        set(&mut config.verbose, build.verbose);
 
         if let Some(ref install) = toml.install {
             config.prefix = install.prefix.clone().map(PathBuf::from);