Merge pull request #2924 from 4JX/master

hbb_common: Use OUT_DIR in build.rs

libs/hbb_common/.gitignore

@@ -1,4 +1,3 @@
 /target
 **/*.rs.bk
 Cargo.lock
-src/protos/

libs/hbb_common/build.rs

@@ -1,8 +1,11 @@
 fn main() {
-    std::fs::create_dir_all("src/protos").unwrap();
+    let out_dir = format!("{}/protos", std::env::var("OUT_DIR").unwrap());
+
+    std::fs::create_dir_all(&out_dir).unwrap();
+    
     protobuf_codegen::Codegen::new()
         .pure()
-        .out_dir("src/protos")
+        .out_dir(out_dir)
         .inputs(&["protos/rendezvous.proto", "protos/message.proto"])
         .include("protos")
         .customize(

libs/hbb_common/src/protos/mod.rs

@@ -0,0 +1 @@
+include!(concat!(env!("OUT_DIR"), "/protos/mod.rs"));