add do_not_cache method

Author: Shourya742

src/bootstrap/src/utils/exec.rs

@@ -101,6 +101,11 @@ impl<'a> BootstrapCommand {
         self.should_cache
     }
 
+    pub fn cache_never(&mut self) -> &mut Self {
+        self.should_cache = false;
+        self
+    }
+
     pub fn args<I, S>(&mut self, args: I) -> &mut Self
     where
         I: IntoIterator<Item = S>,
@@ -201,7 +206,7 @@ impl<'a> BootstrapCommand {
         // We don't know what will happen with the returned command, so we need to mark this
         // command as executed proactively.
         self.mark_as_executed();
-        self.should_cache = false;
+        self.cache_never();
         &mut self.command
     }