Support cross compiling

@h-vetinari

Even though meson supports cross compiling, it seems meson-python does not.

Lines 313 to 348 in 78861f5

    
               @cached_property 
        
               def _stable_abi(self) -> Optional[str]: 
        
                   """Determine stabe ABI compatibility. 
        
                   Examine all files installed in {platlib} that look like 
        
                   extension modules (extension .pyd on Windows, .dll on Cygwin, 
        
                   and .so on other platforms) and, if they all share the same 
        
                   PEP 3149 filename stable ABI tag, return it. 
        
                   All files that look like extension modules are verified to 
        
                   have a file name compatibel with what is expected by the 
        
                   Python interpreter. An exception is raised otherwise. 
        
                   Other files are ignored. 
        
                   """ 
        
                   soext = sorted(_EXTENSION_SUFFIXES, key=len)[0] 
        
                   abis = [] 
        
                   for path, _ in self._wheel_files['platlib']: 
        
                       if path.suffix == soext: 
        
                           match = re.match(r'^[^.]+(.*)$', path.name) 
        
                           assert match is not None 
        
                           suffix = match.group(1) 
        
                           if suffix not in _EXTENSION_SUFFIXES: 
        
                               raise ValueError( 
        
                                   f'Extension module {str(path)!r} not compatible with Python interpreter. ' 
        
                                   f'Filename suffix {suffix!r} not in {set(_EXTENSION_SUFFIXES)}.') 
        
                           match = _EXTENSION_SUFFIX_REGEX.match(suffix) 
        
                           assert match is not None 
        
                           abis.append(match.group('abi')) 
        
                   stable = [x for x in abis if x and re.match(r'abi\d+', x)] 
        
                   if len(stable) > 0 and len(stable) == len(abis) and all(x == stable[0] for x in stable[1:]): 
        
                       return stable[0] 
        
                   return None

assumes that the extension is run on the same interpreter.
We use crossenv to cross compile in conda-forge and crossenv monkey-patches some things but monkey-patching importlib.machinery.EXTENSION_SUFFIXES does not seem like a good idea.

cc @h-vetinari, @rgommers, @eli-schwartz

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	@cached_property
	def _stable_abi(self) -> Optional[str]:
	"""Determine stabe ABI compatibility.

	Examine all files installed in {platlib} that look like
	extension modules (extension .pyd on Windows, .dll on Cygwin,
	and .so on other platforms) and, if they all share the same
	PEP 3149 filename stable ABI tag, return it.

	All files that look like extension modules are verified to
	have a file name compatibel with what is expected by the
	Python interpreter. An exception is raised otherwise.

	Other files are ignored.

	"""
	soext = sorted(_EXTENSION_SUFFIXES, key=len)[0]
	abis = []

	for path, _ in self._wheel_files['platlib']:
	if path.suffix == soext:
	match = re.match(r'^[^.]+(.*)$', path.name)
	assert match is not None
	suffix = match.group(1)
	if suffix not in _EXTENSION_SUFFIXES:
	raise ValueError(
	f'Extension module {str(path)!r} not compatible with Python interpreter. '
	f'Filename suffix {suffix!r} not in {set(_EXTENSION_SUFFIXES)}.')
	match = _EXTENSION_SUFFIX_REGEX.match(suffix)
	assert match is not None
	abis.append(match.group('abi'))

	stable = [x for x in abis if x and re.match(r'abi\d+', x)]
	if len(stable) > 0 and len(stable) == len(abis) and all(x == stable[0] for x in stable[1:]):
	return stable[0]
	return None

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