Tests: XFAIL Swift 6.0 compiler path inference test

Author: kateinoigakukun

Tests/WITExtractorPluginTests/PluginSmokeTests.swift

@@ -2,6 +2,9 @@ import XCTest
 
 class PluginSmokeTests: XCTestCase {
     func testExtractPlugin() throws {
+        #if compiler(>=6.0)
+        throw XCTSkip("XFAIL: Swift compiler path inference is broken in Swift 6.0")
+        #endif
         guard ProcessInfo.processInfo.environment["__XCODE_BUILT_PRODUCTS_DIR_PATHS"] == nil else {
             throw XCTSkip(
                 "\"swift package resolve\" somehow fails to clone git repository only when invoking from Xcode test runner"