Check for 64-bit platform is incorrect

[DamianReeves]

I am attempting to use wasmtime-py with graalpy, but I get the RuntimeError from below:

wasmtime-py/wasmtime/_ffi.py

Lines 8 to 9 in 0513ef7

	if sys.maxsize <= 2**32:
	raise RuntimeError("wasmtime only works on 64-bit platforms right now")

It is suggested to use the same check that was used by pypa/packaging as seen in issue 614 in the repo:

_32_BIT_INTERPRETER = (struct.calcsize("P") == 4)

A different means should be used.

[moreati]

Notes to self

• wasmtime (not py) offers 32 bit builds (e.g. i686, armv7)
• wasmtime-py declares CPython and PyPy compatibility

  wasmtime-py/pyproject.toml

  Lines 36 to 37 in 751d2e7

  	"Programming Language :: Python :: Implementation :: CPython",
  	"Programming Language :: Python :: Implementation :: PyPy",

• GraalPython source tree includes a snapshot of Cpython ctypes https://github.com/oracle/graalpython/tree/master/graalpython/lib-python/3/ctypes
• uv and GraalPython don't currently support one another uv support oracle/graalpython#399
• GraalPy offers most combinations. of Linux, macOS, and Windows builds; on aarch64 & amd64 https://github.com/oracle/graalpython/releases

[moreati]

@DamianReeves does wasmtime-py on GraalPython work for you, if you comment out those two lines?