Issue #17896: Move Windows external lib sources from .. to externals.
diff --git a/Lib/lib-tk/FixTk.py b/Lib/lib-tk/FixTk.py
index 49960c7..953dcd5 100644
--- a/Lib/lib-tk/FixTk.py
+++ b/Lib/lib-tk/FixTk.py
@@ -48,8 +48,8 @@
 
 prefix = os.path.join(sys.prefix,"tcl")
 if not os.path.exists(prefix):
-    # devdir/../tcltk/lib
-    prefix = os.path.join(sys.prefix, os.path.pardir, "tcltk", "lib")
+    # devdir/externals/tcltk/lib
+    prefix = os.path.join(sys.prefix, "externals", "tcltk", "lib")
     prefix = os.path.abspath(prefix)
 # if this does not exist, no further search is needed
 if os.path.exists(prefix):