py: Add dedicated unicode header.

ded0fc77 · Paul Sokolovsky · 17994d1b · ded0fc77
Commit ded0fc77 authored Jun 14, 2014 by Paul Sokolovsky
--- a/py/unicode.h
+++ b/py/unicode.h
+machine_uint_t utf8_ptr_to_index(const byte *s, const byte *ptr);