python,scons,mem-ruby: Tag origin of generated files

This will make it easier to backtrack and modify
such files when needed.

Change-Id: If09b6f848e607fb21a0acf2114ce0b9b0aa4751f
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47301
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/SConscript

@@ -1149,10 +1149,6 @@ def makeDebugFlagCC(target, source, env):
 
     # file header
     code('''
-/*
- * DO NOT EDIT THIS FILE! Automatically generated by SCons.
- */
-
 #include "base/debug.hh"
 
 namespace Debug {
@@ -1206,10 +1202,6 @@ def makeDebugFlagHH(target, source, env):
 
     # file header boilerplate
     code('''\
-/*
- * DO NOT EDIT THIS FILE! Automatically generated by SCons.
- */
-
 #ifndef __DEBUG_${name}_HH__
 #define __DEBUG_${name}_HH__