Work around deadlock risk. Will backport.
diff --git a/Misc/NEWS b/Misc/NEWS
index 3bd5a1f..1a180c2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -63,6 +63,9 @@
 Extension Modules
 -----------------
 
+- Calling Tk_Init twice is refused if the first call failed as that
+  may deadlock.
+
 - Patch #1191065: Fix preprocessor problems on systems where recvfrom
   is a macro.