default-crate-overrides.nix: prost-build needs protobuf

pkgs/build-support/rust/default-crate-overrides.nix

@@ -35,6 +35,7 @@
 , libevdev
 , alsa-lib
 , graphene
+, protobuf
 , ...
 }:
 
@@ -207,6 +208,10 @@ in
     buildInputs = [ postgresql ];
   };
 
+  prost-build = attr: {
+    nativeBuildInputs = [ protobuf ];
+  };
+
   rdkafka-sys = attr: {
     nativeBuildInputs = [ pkg-config ];
     buildInputs = [ rdkafka ];