Switch rustpython to toml recipe

recipes/rustpython/recipe.sh

-GIT=https://github.com/RustPython/RustPython
-BRANCH=redox-release
-CARGOFLAGS=--no-default-features
-export BUILDTIME_RUSTPYTHONPATH=/lib/rustpython/
-
-function recipe_stage() {
-  dest="$(realpath "$1")"
-  mkdir -pv "$dest/lib/"
-  cp -r Lib "$dest/lib/rustpython"
-}

recipes/rustpython/recipe.toml

+[source]
+git = "https://github.com/RustPython/RustPython"
+branch = "redox-release"
+
+[build]
+dependencies = ["openssl", "zlib"]
+template = "custom"
+script = """
+(cd "${COOKBOOK_SOURCE}" && bash scripts/redox/uncomment-cargo.sh)
+export BUILDTIME_RUSTPYTHONPATH=/lib/rustpython
+export OPENSSL_DIR="${COOKBOOK_SYSROOT}"
+export ZLIB_STATIC=1
+COOKBOOK_CARGO_FLAGS+=(--features ssl)
+cookbook_cargo
+mkdir -p "${COOKBOOK_STAGE}/lib"
+rsync -aE \
+  --exclude 'test/' \
+  --exclude '__pycache__/' \
+  --exclude '*.pyc' \
+  --exclude '/README.md' \
+  "${COOKBOOK_SOURCE}"/Lib/ "${COOKBOOK_STAGE}/lib/rustpython"
+"""