fix: avoid interfering with other setuptools plugins (#414)

Fix #413.

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: henryiii

src/scikit_build_core/setuptools/build_cmake.py

@@ -182,7 +182,8 @@ def _has_cmake(dist: Distribution) -> bool:
 def _prepare_extension_detection(dist: Distribution) -> None:
     # Setuptools needs to know that it has extensions modules
 
-    dist.has_ext_modules = lambda: type(dist).has_ext_modules(dist) or _has_cmake(dist)  # type: ignore[method-assign]
+    orig_has_ext_modules = dist.has_ext_modules
+    dist.has_ext_modules = lambda: orig_has_ext_modules() or _has_cmake(dist)  # type: ignore[method-assign]
 
     # Hack for stdlib distutils
     if not setuptools.distutils.__package__.startswith("setuptools"):  # type: ignore[attr-defined]