[Feature]: Compile C rocks with Lua libraries

[vhyrro]

Currently, when trying to compile a set of C modules, rocks will not link any Lua installation on its own. This is a behaviour of luarocks though and so should be emulated.

[vhyrro]

Here's how I'd approach the problem:

• If .c files are found in the build step, then check for available runtime Lua installations (check for the highest possible Lua version given the bounds provided in the rockspec, e.g. lua >= 5.1 would mean 5.4, unless the user provides a --lua-version).
• If the Lua headers are not found on the system (there are crates for this), then we resort to compiling a runtime installation of lua using lua-src, which builds the artifacts to a given location (we probably want to dump this into .cache).