Add schannel feature support and update CI configuration (#4735)

.github/workflows/cargo.yml

@@ -17,7 +17,20 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-xlarge]
-        features: ["", "--features static"]
+        features: ["", "--features static", "--features schannel", "--features schannel,static"]
+        exclude:
+          - os: ubuntu-latest
+            features: "--features schannel"
+          - os: ubuntu-latest
+            features: "--features schannel,static"
+          - os: macos-latest
+            features: "--features schannel"
+          - os: macos-latest
+            features: "--features schannel,static"
+          - os: macos-latest-xlarge
+            features: "--features schannel"
+          - os: macos-latest-xlarge
+            features: "--features schannel,static"
     runs-on: ${{ matrix.os }}
     name: Cargo
     steps:

Cargo.toml

@@ -46,6 +46,7 @@ include = [
 
 [features]
 default = []
+schannel = []
 static = []
 preview-api = []
 

scripts/build.rs

@@ -21,8 +21,12 @@ fn main() {
     let mut config = Config::new(".");
     config
         .define("QUIC_ENABLE_LOGGING", logging_enabled)
-        .define("QUIC_TLS", "openssl")
         .define("QUIC_OUTPUT_DIR", quic_output_dir.to_str().unwrap());
+    if cfg!(feature = "schannel") {
+        config.define("QUIC_TLS", "schannel");
+    } else {
+        config.define("QUIC_TLS", "openssl");
+    }
     if cfg!(feature = "static") {
         config.define("QUIC_BUILD_SHARED", "off");
     }