Convert sdl2_mixer to new recipe format

recipes/sdl2_mixer/recipe.sh

-VERSION=2.0.4
-TAR=https://www.libsdl.org/projects/SDL_mixer/release/SDL2_mixer-$VERSION.tar.gz
-BUILD_DEPENDS=(sdl2 liborbital llvm mesa zlib libogg libvorbis)
-
-function recipe_version {
-    echo "$VERSION"
-    skip=1
-}
-
-function recipe_update {
-    echo "skipping update"
-    skip=1
-}
-
-function recipe_build {
-    sysroot="$(realpath ../sysroot)"
-    export CFLAGS="-I$sysroot/include"
-    export LDFLAGS="-L$sysroot/lib"
-    export SDL_LIBS="-lSDL2 -lorbital $("${TARGET}-pkg-config" --libs osmesa) -lvorbis -logg -lz -lm -lpthread -lstdc++"
-    ./autogen.sh
-    ./configure \
-        --prefix=/ \
-        --build=${BUILD} \
-        --host=${HOST} \
-        --disable-shared \
-        --disable-sdltest \
-        --enable-music-ogg \
-        --disable-music-cmd \
-        --disable-music-mp3 \
-        --disable-smpegtest \
-        --disable-music-midi \
-        --disable-music-mod
-    "$REDOX_MAKE" -j"$($NPROC)"
-    skip=1
-}
-
-function recipe_test {
-    echo "skipping test"
-    skip=1
-}
-
-function recipe_clean {
-    "$REDOX_MAKE" clean
-    skip=1
-}
-
-function recipe_stage {
-    dest="$(realpath $1)"
-    "$REDOX_MAKE" DESTDIR="$dest" install
-    rm -f "$dest/lib/"*.la
-    skip=1
-}

recipes/sdl2_mixer/recipe.toml

+[source]
+tar = "https://www.libsdl.org/projects/SDL_mixer/release/SDL2_mixer-2.0.4.tar.gz"
+
+[build]
+template = "custom"
+dependencies = [
+    "sdl2",
+    "liborbital",
+    "llvm",
+    "mesa",
+    "zlib",
+    "libogg",
+    "libvorbis",
+]
+script = """
+export SDL_LIBS="-lSDL2 -lorbital $("${TARGET}-pkg-config" --libs osmesa) -lvorbis -logg -lz -lm -lpthread -lstdc++"
+COOKBOOK_CONFIGURE_FLAGS=(
+    --prefix=/
+    --host="${TARGET}"
+    --disable-shared
+    --disable-sdltest
+    --enable-music-ogg
+    --disable-music-cmd
+    --disable-music-mp3
+    --disable-smpegtest
+    --disable-music-midi
+    --disable-music-mod
+)
+set -x
+cookbook_configure
+"""