Remove weird spacing in typeset version of the chapter head.
diff --git a/Doc/ext/windows.tex b/Doc/ext/windows.tex
index caac646..bff7f05 100644
--- a/Doc/ext/windows.tex
+++ b/Doc/ext/windows.tex
@@ -1,4 +1,4 @@
-\chapter{Building C and \Cpp{} Extensions on Windows
+\chapter{Building C and \Cpp{} Extensions on Windows%
      \label{building-on-windows}}