Remove a few more Python 2-compatibility workarounds

cibuildwheel/bashlex_eval.py

@@ -60,12 +60,8 @@ def evaluate_word_node(node, context):
 def evaluate_command_node(node, context):
     words = [evaluate_node(part, context=context) for part in node.parts]
     command = ' '.join(words)
-    output = subprocess.check_output(shlex.split(command), env=context.environment)
+    return subprocess.check_output(shlex.split(command), env=context.environment, universal_newlines=True)
 
-    if sys.version_info[0] >= 3:
-        return output.decode('utf8', 'replace')
-    else:
-        return output
 
 def evaluate_parameter_node(node, context):
     return context.environment.get(node.value, '')