fix: do not require Ninja

This should prevent bootstrapping issues between CMake PyPI distribution and Ninja PyPI distribution when building either one from sources.

Author: mayeut

pyproject.toml

@@ -54,7 +54,8 @@ ctest = "cmake:ctest"
 minimum-version = "0.8"
 build-dir = "build/{wheel_tag}"
 cmake.version = ""  # We are cmake, so don't request cmake
-ninja.make-fallback = false
+ninja.version = ""  # requiring ninja could cause it to request CMake if it needs to be built from sources, fallback to make
+ninja.make-fallback = true
 wheel.py-api = "py3"
 wheel.expand-macos-universal-tags = true
 wheel.install-dir = "cmake/data"
@@ -65,6 +66,12 @@ template = '''
 version = "${version}"
 '''
 
+[[tool.scikit-build.overrides]]
+if.env.CIBUILDWHEEL = true
+# ninja.version = ">=1.11"
+# ninja.make-fallback = false
+ninja.version = ""
+ninja.make-fallback = true
 
 [tool.cibuildwheel]
 build = "cp39-*"