[tools] Remove py2 remains

src/gen-os2-unicode-ranges.py

@@ -8,11 +8,6 @@ import io
 import re
 import sys
 
-try:
-  reload(sys)
-  sys.setdefaultencoding('utf-8')
-except NameError:
-  pass  # Python 3
 
 print ("""static OS2Range _hb_os2_unicode_ranges[] =
 {""")

src/gen-use-table.py

@@ -151,18 +151,13 @@ property_names = [
 	'Overstruck',
 ]
 
-try:
-	basestring
-except NameError:
-	basestring = str
-
 class PropertyValue(object):
 	def __init__(self, name_):
 		self.name = name_
 	def __str__(self):
 		return self.name
 	def __eq__(self, other):
-		return self.name == (other if isinstance(other, basestring) else other.name)
+		return self.name == (other if isinstance(other, str) else other.name)
 	def __ne__(self, other):
 		return not (self == other)
 	def __hash__(self):

test/shaping/hb_test_tools.py

@@ -2,10 +2,6 @@
 
 import sys, os, re, difflib, unicodedata, errno, cgi, itertools
 from itertools import *
-try:
-	import unicodedata2 as unicodedata
-except Exception:
-	pass
 
 diff_symbols = "-+=*&^%$#@!~/"
 diff_colors = ['red', 'green', 'blue']