add a warning about bgen being removed

Tools/README

@@ -9,6 +9,7 @@ audiopy		Audiopy is a program to control the Solaris audio
 
 bgen		Generate complete extension modules from a
 		description.  Still under development!
+                WARNING: bgen has been removed in 3.0
 
 compiler	Tools used to maintain the compiler package in the
 		standard library.

Tools/bgen/README

@@ -5,3 +5,5 @@ This directory contains BGEN -- a package that helps in generating
 complete source code for Python extension module.  For examples of its
 use, see the Mac Python source distribution (available separately
 from the Python ftp archives).  Note that BGEN is not Mac specific!
+
+WARNING: bgen has been removed in 3.0.