Update SwiftDriverTests.swift

Remove Windows test

Author: compnerd

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -4442,7 +4442,7 @@ final class SwiftDriverTests: XCTestCase {
       var envVars = ProcessEnv.vars
       envVars["SWIFT_DRIVER_LD_EXEC"] = ld.pathString.nativePathString()
 
-      let targets = ["x86_64-unknown-linux-gnu", "x86_64-apple-macosx10.9", "x86_64-unknown-windows-msvc"]
+      let targets = ["x86_64-unknown-linux-gnu", "x86_64-apple-macosx10.9"]
       for target in targets {
         var driver = try Driver(args: ["swiftc", "foo.swift", "-lto=llvm-thin", "-target", target],
                                 env: envVars)