pd-lua update to 0.11.4

Merged Albert Gräf requested to merge aggraef/purr-data:pdlua-update into master

This updates pd-lua to 0.11.4, cf. https://github.com/agraef/pd-lua/releases/.

pd-lua now uses the latest pd-lib-builder and includes lua as a submodule, so building it as a part of purr-data becomes a lot easier. Most notably, Lua 5.4 is linked statically from lua/onelua.c, so Lua isn't needed as a build or runtime dependency any more and the resulting external will use exactly the same Lua version across different platforms.

Also, the latest pd-lua sports various important bugfixes and documentation updates.

Edited by Albert Gräf

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