Revert "build_pyodide: try more recent pyodide-build"

This reverts commit f7876a97ee.

There's some emscripten mismatch, will try to bump it later.

pyodide/build_pyodide.sh

@@ -2,7 +2,9 @@
 set -ex
 
 PYODIDE_VERSION=0.29.3
-SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+PYODIDE_BUILD_VERSION=0.33.0
+PYODIDE_XBUILDENV_ROOT="${HOME}/.cache/.pyodide-xbuildenv-${PYODIDE_BUILD_VERSION}"
+PYODIDE_XBUILDENV="${PYODIDE_XBUILDENV_ROOT}/${PYODIDE_VERSION}"
 
 # Script is assuming that it will be possible to execute it multiple times
 # therefore we're clearing venv each time and ignoring existing 'emsdk' folder.
@@ -14,14 +16,12 @@ source .venv/bin/activate
 
 # Install pyodide cross build environment.
 # Instructions: https://pyodide.org/en/stable/development/building-packages.html
-uv pip install -r "${SCRIPT_DIR}/requirements.txt"
+uv pip install "pyodide-build==${PYODIDE_BUILD_VERSION}"
 # `uv run` is required, so xbuildenv would skip using `pip`.
 uv run pyodide xbuildenv install "${PYODIDE_VERSION}"
 uv run pyodide xbuildenv install-emscripten
 
-# Cache path includes a hash segment that varies by pyodide-build version,
-# so query it instead of constructing it manually.
-EMSDK_ROOT=$(uv run pyodide config get emsdk_dir)
+EMSDK_ROOT="${PYODIDE_XBUILDENV}/emsdk"
 [ -f "${EMSDK_ROOT}/emsdk_env.sh" ] && source "${EMSDK_ROOT}/emsdk_env.sh"
 [ -f "${EMSDK_ROOT}/../../emsdk_env.sh" ] && source "${EMSDK_ROOT}/../../emsdk_env.sh"
 which emcc

pyodide/requirements.txt

@@ -1 +0,0 @@
-pyodide-build==0.39.0