auto-detecting platform in Makefile

[Luiz Henrique de Figueiredo <lhf@...>]

Here is a Makefile for Lua 5.3 that detects the platform using name [1].
Place it in src/ and do "make clean guess" to try it.

I've tested it in Linux and macOS but I don't have access to other
platforms. Perhaps some of you do. In particular, I don't know whether
FreeBSD, NetBSD, OpenBSD are all the same.

All contributions welcome. Thanks.
--lhf

[1] https://en.wikipedia.org/wiki/Uname

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