Use bundled Lua for Dreamcast instead of kos-ports

Ensures the LUA_USE_C89 fix always applies regardless of whether
kos-ports Lua happens to be installed, and removes Lua as a
kos-ports prerequisite.

Signed-off-by: Panagiotis Georgiadis <pgeorgia@redhat.com>

Author: drpaneas

Packaging/dreamcast/README.md

@@ -4,9 +4,10 @@ This folder contains the Dreamcast packaging flow for DevilutionX.
 
 ## Prerequisites
 
-- [KallistiOS](http://gamedev.allusion.net/softprj/kos/) (KOS) with kos-ports (SDL1, zlib, bzip2)
+- [KallistiOS](https://kos-docs.dreamcast.wiki/) (KOS) with kos-ports (zlib, bzip2)
 - [`mkdcdisc`](https://gitlab.com/simulant/mkdcdisc) for CDI disc image creation
 
+SDL (GPF SDL with DMA video) and Lua are built from source automatically by `build.sh`.
 No external `fmt` patch is required. The build applies a bundled SH4 `libfmt` patch automatically.
 
 ## Game Data (Required)

Packaging/dreamcast/build.sh

@@ -32,8 +32,9 @@ fi
 
 GPF_SDL_DIR="${SCRIPT_DIR}/SDL-gpf"
 GPF_SDL_LIB="${KOS_BASE}/addons/lib/dreamcast/libSDL.a"
+GPF_SDL_HEADER="${KOS_BASE}/addons/include/dreamcast/SDL/SDL_dreamcast.h"
 
-if [ ! -f "${GPF_SDL_LIB}" ]; then
+if [ ! -f "${GPF_SDL_HEADER}" ]; then
     echo "Building GPF SDL (SDL-dreamhal--GLDC) for DMA video..."
     if [ ! -d "${GPF_SDL_DIR}" ]; then
         git clone --depth 1 -b SDL-dreamhal--GLDC \
@@ -52,6 +53,7 @@ cmake_args=(
     -S "${ROOT_DIR}"
     -B "${BUILD_DIR}"
     -DCMAKE_TOOLCHAIN_FILE="${ROOT_DIR}/CMake/platforms/dreamcast.toolchain.cmake"
+    -DDEVILUTIONX_SYSTEM_LUA=OFF
 )
 
 if command -v ninja >/dev/null 2>&1; then

docs/building.md

@@ -415,9 +415,10 @@ cmake --build build
 
 ### Installing dependencies
 
-- [KallistiOS](http://gamedev.allusion.net/softprj/kos/) (KOS) with kos-ports (SDL1, zlib, bzip2)
+- [KallistiOS](https://kos-docs.dreamcast.wiki/) (KOS) with kos-ports (zlib, bzip2)
 - [`mkdcdisc`](https://gitlab.com/simulant/mkdcdisc) for CDI disc image creation
 
+SDL (GPF SDL with DMA video) and Lua are built from source automatically.
 No external `fmt` patch is required. The build applies a bundled SH4 fix automatically.
 
 ### Game data