app-editors/neovim: migrate to lua-single.eclass

Both the latest release and the live ebuild.

Set LUA_COMPAT to 'lua5-{1,2} luajit' as per the upstream build scripts;
builds fine against lua5.3 but I haven't reviewed the included Lua
scripts for compatibility with that version and there is no test phase
yet.

Migration-wise, one thing worth pointing out is that upstream build
scripts attempt to locate some of the Lua modules by locating a Lua
interpreter on the *build* system and telling to load those modules. For
now all that has been changed is that we force the use the interpreter
to match the value of LUA_SINGLE_TARGET (nb. the messages like "[lua5.2]
file not found" can be ignored - there is one check which expects an
absolute path and by setting LUA_PRG to $ELUA instead of $LUA we can
re-use this variable for dev-lua/luv detection, this is just a status
message though), then again it might require further revision. Will
leave this to the actual maintainers.

Beyond the above, it was just having to force CMake to look for a
specific Lua version (usual) as well as a tweak to dev-lua/luv detection
so that it works with multi-impl installations of that package
(expected).

Closes: https://bugs.gentoo.org/752912
Signed-off-by: Marek Szuba <marecki@gentoo.org>

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