Update re2

third_party/re2/re2/make_unicode_casefold.py

Index: third_party/re2/re2/make_unicode_casefold.py
diff --git a/third_party/re2/re2/make_unicode_casefold.py b/third_party/re2/re2/make_unicode_casefold.py
index 3375d2ef1bf90b2b554a50a07594110555f6341b..d215eb195e4b5e2ead9236188061fcb339463e95 100755
--- a/third_party/re2/re2/make_unicode_casefold.py
+++ b/third_party/re2/re2/make_unicode_casefold.py
@@ -9,7 +9,8 @@
 
 """Generate C++ table for Unicode case folding."""
 
-import unicode, sys
+import sys
+import unicode
 
 _header = """
 // GENERATED BY make_unicode_casefold.py; DO NOT EDIT.
@@ -130,11 +131,11 @@ def main():
     foldpairs.sort()
     foldranges = _MakeRanges(foldpairs)
     print "// %d groups, %d pairs, %d ranges" % (len(casegroups), len(foldpairs), len(foldranges))
-    print "CaseFold unicode_%s[] = {" % (name,)
+    print "const CaseFold unicode_%s[] = {" % (name,)
     for lo, hi, delta in foldranges:
       print "\t{ %d, %d, %s }," % (lo, hi, delta)
     print "};"
-    print "int num_unicode_%s = %d;" % (name, len(foldranges),)
+    print "const int num_unicode_%s = %d;" % (name, len(foldranges),)
     print ""
 
   print _header