net-analyzer/rrdtool: migrate to lua.eclass

Featuring proper multi-impl support including testing. Lua bindings have
been confirmed to build, test and install fine for all five
implementations currently listed in LUA_COMPAT.

Speaking of testing, in order for it to be complete the file "test.png"
produced for each enabled Lua target by rrd.graphv should be visually
inspected. For obvious reasons automating this would be way more trouble
than it is worth (an image recogniser as a build-time dependency???),
that said I *have* inspected those images while testing whether LuaJIT
as well as PUC Lua 5.2, 5.3 and 5.4 really are supported (although
upstream documentation says "Lua 5.0 or newer" their build scripts only
explicitly mention PUC Lua 5.0 and 5.1, and LuaJIT is not mentioned in
either) and they looked fine for all five implementations.

Closes: https://bugs.gentoo.org/752780
Signed-off-by: Marek Szuba <marecki@gentoo.org>

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