tarantool / tarantool / 14330619601

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box: fix out-of-bounds read in index_opts_parse_layout()

It's not safe to use `strlcpy()` for non-null-terminated strings, because
this function requires a null-terminated string. Found by AddressSanitizer.

Follow-up tarantool/tarantool-ee#1089

NO_DOC=bugfix
NO_CHANGELOG=unreleased
NO_TEST=hard to create a stable reproducer

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