Avoid using types from Lua includes in rpmlua.h again #893
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rpmlua.h was originally written in a way that allows it to be included
regardless of whether Lua is actually enabled in rpm or not, or where
Lua headers are, specifically to isolate the rest of rpm from these
details. That was changed in commit 62bd622
when <lauxlib.h> started getting included in rpmlua.h, which leaks to
places like librpmbuild which do not directly use Lua.
The way Lua typedef's the luaL_Reg struct to itself defies my C fu for
for handling this in some nicer typesafe way, fix this all by just using
a void pointer instead, this is just an internal API where buyer can be
expected to beware.
Fixes #888