Bump Windows buildno (installer changes were made earlier).

PCbuild/BUILDno.txt

@@ -33,6 +33,8 @@ How to change the Windows build number:
 
 Windows Python BUILD numbers
 ----------------------------
+  23    2.2a3
+        07-Sep-2001
   22    2.2a2
         22-Aug-2001
   21    2.2a1

PCbuild/pythoncore.dsp

@@ -724,11 +724,11 @@ SOURCE=..\Modules\getbuildinfo.c
 
 !IF  "$(CFG)" == "pythoncore - Win32 Release"
 
-# ADD CPP /D BUILD=22
+# ADD CPP /D BUILD=23
 
 !ELSEIF  "$(CFG)" == "pythoncore - Win32 Debug"
 
-# ADD CPP /D BUILD=22
+# ADD CPP /D BUILD=23
 
 !ELSEIF  "$(CFG)" == "pythoncore - Win32 Alpha Debug"