test: fix encoding of temp files

Author: bpabel

tests/test_build.py

@@ -14,6 +14,7 @@
 
 LIST_FILES_TEMPLATE = """\
 #!{python}
+# -*- coding: utf-8 -*-
 import sys
 from os.path import join
 if '--deleted' not in sys.argv:
@@ -75,6 +76,7 @@ def test_build_module_no_docstring():
 def test_build_package_with_unicode(copy_sample):
     list_files_template = """\
 #!{python}
+# -*- coding: utf-8 -*-
 import sys
 from os.path import join
 if '--deleted' not in sys.argv: