An unsigned overflow in luai_makeseed()

Hello,

the function luai_makeseed() in lauxlib.c has the following expression [1]:

res ^= (res >> 3) + (res << 7) + buff[i];

where res has type "unsigned integer". This arithmetic has an unsigned 
overflow.
This is of course undefined behavior from a language point of view, but 
maybe it is used here intentionally?

1. https://github.com/lua/lua/blob/c6b484823806e08e1756b1a6066a3ace6f080fae/lauxlib.c#L1167

Sergey

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