Merge pull request #295 from solson/oli-obk-patch-2

Don't rebuild miri even if nothing changed

build.rs

@@ -3,4 +3,6 @@ use std::env;
 fn main() {
     // Forward the profile to the main compilation
     println!("cargo:rustc-env=PROFILE={}", env::var("PROFILE").unwrap());
+    // Don't rebuild miri even if nothing changed
+    println!("cargo:rerun-if-changed=build.rs");
 }