Update Windows build to sqlite 3.6.21.
diff --git a/PCbuild/pyproject.vsprops b/PCbuild/pyproject.vsprops
index 1c69a7d..3039885 100644
--- a/PCbuild/pyproject.vsprops
+++ b/PCbuild/pyproject.vsprops
@@ -74,7 +74,7 @@
 	/>
 	<UserMacro
 		Name="sqlite3Dir"
-		Value="$(externalsDir)\sqlite-3.5.9"
+		Value="$(externalsDir)\sqlite-3.6.21"
 	/>
 	<UserMacro
 		Name="bz2Dir"
diff --git a/PCbuild/readme.txt b/PCbuild/readme.txt
index 44b7b8f..0386b45 100644
--- a/PCbuild/readme.txt
+++ b/PCbuild/readme.txt
@@ -107,7 +107,7 @@
     Wraps Berkeley DB 4.7.25, which is currently built by _bsddb.vcproj.
     project (see below).
 _sqlite3
-    Wraps SQLite 3.5.9, which is currently built by sqlite3.vcproj (see below).
+    Wraps SQLite 3.6.21, which is currently built by sqlite3.vcproj (see below).
 _tkinter
     Wraps the Tk windowing system.  Unlike _bsddb and _sqlite3, there's no
     corresponding tcltk.vcproj-type project that builds Tcl/Tk from vcproj's
diff --git a/PCbuild/vs9to8.py b/PCbuild/vs9to8.py
index 2dfbd5d..a4e6801 100644
--- a/PCbuild/vs9to8.py
+++ b/PCbuild/vs9to8.py
@@ -24,7 +24,7 @@
 
             # Bah. VS8.0 does not expand macros in file names.
             # Replace them here.
-            lines = lines.replace('$(sqlite3Dir)', '..\\..\\..\\sqlite-3.5.9')
+            lines = lines.replace('$(sqlite3Dir)', '..\\..\\..\\sqlite-3.6.21')
             lines = lines.replace('$(bsddbDir)\\..\\..', '..\\..\\..\\db-4.7.25.0\\build_windows\\..')
             lines = lines.replace('$(bsddbDir)', '..\\..\\..\\db-4.7.25.0\\build_windows')