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Fix building with luarocks

Building with `luarocks make` was broken in f3c8bf6 since
DMPACK_USE_AMALGAMATION is not defined by default. Change defines in
lmpack.c to only use system libmpack if DMPACK_USE_SYSTEM is defined.

Bump to workaround luarocks.org caching

It seems luarocks.orgs caches a previously uploaded rockspec for a version, even
if we explicitly delete the version.

Bump and adapt build scripts for repository transfer