add Meson build system

This is, I think, equal to the autotools build-system in every practical
way. The man pages have hardcoded numbers. I think this is okay, as all
modern operating systems seem to use the same man page numbering now.

I've also chosen to not generate a config.h file with Meson. This makes
using libXau as a subproject safer, since we don't have to worry about
conflicting config.h files, plus there are only a couple of declarations
that are actually used. This also saves some configure time in writing
out an additional file.

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