Print "Checking/Building ..." message even when --dry-run is passed

This makes it a lot easier to understand what commands will be run without
having to parse the `-vv` output, which isn't meant to be user facing.

src/bootstrap/lib.rs

@@ -1019,10 +1019,12 @@ fn verbose_than(&self, level: usize, msg: &str) {
     }
 
     fn info(&self, msg: &str) {
-        if self.config.dry_run() {
-            return;
+        match self.config.dry_run {
+            DryRun::SelfCheck => return,
+            DryRun::Disabled | DryRun::UserSelected => {
+                println!("{}", msg);
+            }
         }
-        println!("{}", msg);
     }
 
     /// Returns the number of parallel jobs that have been configured for this