Revert "Ship with BoringSSL (#135)"

This reverts commit 5dbf2fa.

Author: FranzBusch

Package.swift

@@ -46,8 +46,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-nio.git", from: "2.55.0"),
-        .package(url: "https://github.com/apple/swift-nio-ssl", from: "2.25.0"),
-        .package(url: "https://github.com/swift-server/swift-service-lifecycle.git", from: "2.1.0"),
+        .package(url: "https://github.com/swift-server/swift-service-lifecycle.git", from: "2.0.0-beta.1"),
         .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
         // The zstd Swift package produces warnings that we cannot resolve:
         // https://github.com/facebook/zstd/issues/3328
@@ -57,7 +56,7 @@ let package = Package(
         .target(
             name: "Crdkafka",
             dependencies: [
-                .product(name: "NIOSSL", package: "swift-nio-ssl"),
+                "COpenSSL",
                 .product(name: "libzstd", package: "zstd"),
             ],
             exclude: rdkafkaExclude,
@@ -66,9 +65,7 @@ let package = Package(
             cSettings: [
                 // dummy folder, because config.h is included as "../config.h" in librdkafka
                 .headerSearchPath("./custom/config/dummy"),
-                .headerSearchPath("./custom/include"),
                 .headerSearchPath("./librdkafka/src"),
-                .define("_GNU_SOURCE", to: "1"), // Fix build error for Swift 5.9 onwards
             ],
             linkerSettings: [
                 .linkedLibrary("curl"),
@@ -91,6 +88,14 @@ let package = Package(
                 "Kafka",
             ]
         ),
+        .systemLibrary(
+            name: "COpenSSL",
+            pkgConfig: "openssl",
+            providers: [
+                .brew(["libressl"]),
+                .apt(["libssl-dev"]),
+            ]
+        ),
         .testTarget(
             name: "KafkaTests",
             dependencies: ["Kafka"]