Correctly propagate toolchain setting in SConstruct.

samples/SConscript

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 from os.path import join
-Import('sample context')
+Import('sample context tools')
 
 def ConfigureObjectFiles():
-  env = Environment()
+  env = Environment(tools=tools)
   env.Replace(**context.flags['sample'])
   context.ApplyEnvOverrides(env)
   return env.Object(sample + '.cc')
 
 sample_object = ConfigureObjectFiles()
 Return('sample_object')