[WASM] Add target_swift_api_extract config in lit.cfg for wasi

Author: kateinoigakukun

test/lit.cfg

@@ -1521,6 +1521,10 @@ elif run_os == 'wasi':
         config.swift_symbolgraph_extract,
         '-target', config.variant_triple,
         mcp_opt])
+    config.target_swift_api_extract = ' '.join([
+        config.swift_api_extract,
+        '-target', config.variant_triple,
+        '-sdk', shell_quote(config.variant_sdk)])
     config.target_swift_ide_test = (
         '%s -target %s %s %s %s' %
         (config.swift_ide_test, config.variant_triple, resource_dir_opt,