SCons: add comments to SConscript documenting bug workaround

--HG--
extra : convert_revision : e6cdffe953d56b96c76c7ff14d2dcc3de3ccfcc3

src/cpu/SConscript

@@ -148,6 +148,8 @@ if env['USE_CHECKER']:
             print i,
         print ", please set USE_CHECKER=False or use one of those CPU models"
         Exit(1)
+# Workaround for bug in SCons version > 0.97d20071212
+# Scons bug id: 2006 M5 Bug id: 308
 else:
     Dir('checker')
 

src/mem/SConscript

@@ -35,6 +35,8 @@ SimObject('Bus.py')
 SimObject('PhysicalMemory.py')
 SimObject('MemObject.py')
 
+# Workaround for bug in SCons version > 0.97d20071212
+# Scons bug id: 2006 M5 Bug id: 308
 Dir('config')
 
 Source('bridge.cc')