Add supporting files for test_tokenize

Supporting files not associated with another test:
 - tokenize_tests-latin1-coding-cookie-and-utf8-bom-sig.txt
 - tokenize_tests-utf8-coding-cookie-and-no-utf8-bom-sig.txt
 - tokenize_tests-utf8-coding-cookie-and-utf8-bom-sig.txt

Lib/test/tokenize_tests-latin1-coding-cookie-and-utf8-bom-sig.txt

@@ -0,0 +1,13 @@
+# -*- coding: latin1 -*-
+# IMPORTANT: this file has the utf-8 BOM signature '\xef\xbb\xbf'
+# at the start of it.  Make sure this is preserved if any changes
+# are made!  Also note that the coding cookie above conflicts with
+# the presence of a utf-8 BOM signature -- this is intended.
+
+# Arbitrary encoded utf-8 text (stolen from test_doctest2.py).
+x = 'ЉЊЈЁЂ'
+def y():
+    """
+    And again in a comment.  ЉЊЈЁЂ
+    """
+    pass

Lib/test/tokenize_tests-utf8-coding-cookie-and-no-utf8-bom-sig.txt

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+# IMPORTANT: unlike the other test_tokenize-*.txt files, this file
+# does NOT have the utf-8 BOM signature '\xef\xbb\xbf' at the start
+# of it.  Make sure this is not added inadvertently by your editor
+# if any changes are made to this file!
+
+# Arbitrary encoded utf-8 text (stolen from test_doctest2.py).
+x = 'ЉЊЈЁЂ'
+def y():
+    """
+    And again in a comment.  ЉЊЈЁЂ
+    """
+    pass

Lib/test/tokenize_tests-utf8-coding-cookie-and-utf8-bom-sig.txt

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+# IMPORTANT: this file has the utf-8 BOM signature '\xef\xbb\xbf'
+# at the start of it.  Make sure this is preserved if any changes
+# are made!
+
+# Arbitrary encoded utf-8 text (stolen from test_doctest2.py).
+x = 'ЉЊЈЁЂ'
+def y():
+    """
+    And again in a comment.  ЉЊЈЁЂ
+    """
+    pass