agent/protocols: Remove cargo:rerun-if-changed in build.rs

So that the build.rs will be re-runed if any file
within the package is changed.

Signed-off-by: Tim Zhang <tim@hyper.sh>

src/agent/protocols/build.rs

@@ -15,11 +15,6 @@ fn main() {
         "protos/oci.proto",
     ];
 
-    // Tell Cargo that if the .proto files changed, to rerun this build script.
-    protos
-        .iter()
-        .for_each(|p| println!("cargo:rerun-if-changed={}", p));
-
     Codegen::new()
         .out_dir("src")
         .inputs(&protos)