Make brotli test available on Linux

Author: zhenchaoli

Tests/Foundation/TestURLSession.swift

@@ -32,9 +32,6 @@ final class TestURLSession: LoopbackServerTest, @unchecked Sendable {
     }
 
     func test_dataTaskWithAcceptEncoding() async {
-        #if !os(Windows)
-        throw XCTSkip("This test is currently only enabled on Windows")
-        #else
         let urlString = "http://127.0.0.1:\(TestURLSession.serverPort)/accept-encoding"
         let url = URL(string: urlString)!
         let d = DataTask(with: expectation(description: "GET \(urlString): with a delegate"))
@@ -43,7 +40,6 @@ final class TestURLSession: LoopbackServerTest, @unchecked Sendable {
         if !d.error {
             XCTAssertEqual(d.capital, "deflate, gzip, br", "test_dataTaskWithURLRequest returned an unexpected result")
         }
-        #endif
     }
 
     func test_dataTaskWithURLCompletionHandler() async {
@@ -272,9 +268,6 @@ final class TestURLSession: LoopbackServerTest, @unchecked Sendable {
     }
 
     func test_brotliDataTask() async {
-        #if !os(Windows)
-        throw XCTSkip("This test is currently only enabled on Windows")
-        #else
         let urlString = "http://127.0.0.1:\(TestURLSession.serverPort)/brotli-response"
         let url = URL(string: urlString)!
         let d = DataTask(with: expectation(description: "GET \(urlString): brotli response"))
@@ -283,7 +276,6 @@ final class TestURLSession: LoopbackServerTest, @unchecked Sendable {
         if !d.error {
             XCTAssertEqual(d.capital, "Hello World!")
         }
-        #endif
     }
 
     func test_downloadTaskWithURL() async {