Fix cherry picking mistake

Author: adincebic

swift/toolchains/xcode_swift_toolchain.bzl

@@ -117,23 +117,6 @@ _DEVELOPER_DIR_SYMLINKS = [
     "/var/db/xcode_select_link",
 ]
 
-def _swift_developer_lib_dir(platform_framework_dir):
-    """Returns the directory containing extra Swift developer libraries.
-
-    Args:
-        platform_framework_dir: The developer platform framework directory for
-            the current platform.
-
-    Returns:
-        The directory containing extra Swift-specific development libraries and
-        swiftmodules.
-    """
-    return paths.join(
-        paths.dirname(paths.dirname(platform_framework_dir)),
-        "usr",
-        "lib",
-    )
-
 def _platform_developer_framework_dir(developer_dir, target_triple):
     """Returns the Developer framework directory for the platform.
 
@@ -294,11 +277,16 @@ def _swift_linkopts_cc_info(
     # Add the linker path to the directory containing the dylib with Swift
     # extensions for the XCTest module.
     if platform_developer_framework_dir:
-        linkopts.extend([
-            "-L{}".format(
-                _swift_developer_lib_dir(platform_developer_framework_dir),
+        swift_lib_dir_path = swift_developer_lib_dir([
+            struct(
+                developer_path_label = "platform",
+                path = platform_developer_framework_dir,
             ),
         ])
+        if swift_lib_dir_path:
+            linkopts.extend([
+                "-L{}".format(swift_lib_dir_path),
+            ])
 
     return CcInfo(
         linking_context = cc_common.create_linking_context(