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Fix fastsearch for UCS2 and UCS4

* If needle is 0, try (p[0] >> 16) & 0xff for UCS4
 * Disable fastsearch_memchr_1char() if needle is zero for UCS2 and UCS4
V
Victor Stinner committed
8cc70dcf7020f1e5c286fed5b2a1034f5ba36afe
Parent: c5af773