make webrtc-rs optional feature

Cargo.toml

@@ -6,6 +6,10 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+default = ["webrtc"]
+webrtc = ["dep:webrtc"]
+
 [dependencies]
 # new flexi_logger failed on rustc 1.75
 flexi_logger = { version = "0.27", features = ["async"] }
@@ -61,7 +65,7 @@ rustls-pki-types = "1.11"
 rustls-native-certs = "0.8"
 webpki-roots = "1.0.4"
 async-recursion = "1.1"
-webrtc = "0.14.0"
+webrtc = { version = "0.14.0", optional = true }
 
 [target.'cfg(not(any(target_os = "android", target_os = "ios")))'.dependencies]
 mac_address = "1.1"
@@ -73,7 +77,7 @@ protobuf-codegen = { version = "3.7" }
 
 [dev-dependencies]
 clap = "4.5.51"
-webrtc-signal = "0.1.1"
+webrtc = "0.14.0"
 
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = { version = "0.3", features = [