kernel: get rid of custom build recipe in favor of the kernel Makefile

See merge request !416

Override RISC-V CFLAGS in cargo.toml

See merge request !415

Add working build script for GLEW

See merge request !414

Makes RISC-V builds work without cc-rs patch, as apparently
CFLAGS take precedence over cc-rs' heuristics

I left GLEW in WIP until one of us tests it. However, it compiles fine
so I'll submit it for now.

Luarocks port

See merge request !413

add luv and lua-compat-5.3

See merge request !412

package(games): OpenTyrian (1995/2004)

See merge request !411

Add libuv library

See merge request !409

Update uutils

See merge request !408

Improve python310 recipe

See merge request !407