Update backend.py

Author: mayeut

_build_backend/backend.py

@@ -14,7 +14,7 @@
 get_requires_for_build_sdist = _orig.get_requires_for_build_sdist
 
 
-def strtobool(value: str) -> bool:
+def _strtobool(value: str) -> bool:
     """
     Converts a environment variable string into a boolean value.
     """
@@ -31,7 +31,7 @@ def get_requires_for_build_wheel(
 ) -> list[str]:
     packages_orig = _orig.get_requires_for_build_wheel(config_settings)
     allow_ninja = any(
-        strtobool(os.environ.get(var, ""))
+        _strtobool(os.environ.get(var, ""))
         for var in ("CMAKE_PYTHON_DIST_FORCE_NINJA_DEP", "CMAKE_PYTHON_DIST_ALLOW_NINJA_DEP")
     )
     packages = []
@@ -45,7 +45,7 @@ def get_requires_for_build_wheel(
     return packages
 
 
-def bootstrap_build(temp_path: str, config_settings: dict[str, list[str] | str] | None = None) -> str:
+def _bootstrap_build(temp_path: str, config_settings: dict[str, list[str] | str] | None = None) -> str:
     import hashlib
     import re
     import shutil
@@ -126,7 +126,7 @@ def build_wheel(
     # Let's try bootstrapping CMake
     import tempfile
     with tempfile.TemporaryDirectory() as temp_path:
-        cmake_path = bootstrap_build(temp_path, config_settings)
+        cmake_path = _bootstrap_build(temp_path, config_settings)
         assert cmake_path
         os.environ["CMAKE_EXECUTABLE"] = cmake_path
         return _orig.build_wheel(wheel_directory, config_settings, metadata_directory)