Problematic script darwin-python-path.py when running through uv

[jdumas]

This script is causing issues when run through uv:

nanobind/cmake/darwin-python-path.py

Lines 10 to 15 in 879bca4

	import ctypes
	dyld = ctypes.cdll.LoadLibrary('/usr/lib/system/libdyld.dylib')
	namelen = ctypes.c_ulong(1024)
	name = ctypes.create_string_buffer(b'\000', namelen.value)
	dyld._NSGetExecutablePath(ctypes.byref(name), ctypes.byref(namelen))
	print(name.value.decode('utf8').strip())

It's basically returning nothing. This is causing nanobind_resolve_python_path() to produce an error when running nanobind through uv build under macOS.

> uv run --no-project python <nanobind>/cmake/darwin-python-path.py