Remove deprecated setup_requires to enforce PEP 517 builds

Remove setup_requires from setup.py since build requirements are now
properly declared in pyproject.toml. This eliminates the deprecated
fetch_build_eggs code path and forces proper PEP 517 build behavior.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: electronstudio

setup.py

@@ -44,7 +44,6 @@ def has_ext_modules(foo):
     ],
     packages=["raylib", "pyray"],
     include_package_data=True,
-    setup_requires=["cffi>=1.17.1"],
     install_requires=["cffi>=1.17.1"],
     distclass=BinaryDistribution,
     cffi_modules=["raylib/build.py:ffibuilder"]