Use member names to initialize modules

[radarhere]

Borrowing an idea from #5201

Rather than creating a struct with the members in order, and adding comments to describe their names,

Pillow/src/_imaging.c

Lines 4440 to 4446 in 2810d7c

	static PyModuleDef module_def = {
	PyModuleDef_HEAD_INIT,
	"_imaging", /* m_name */
	NULL, /* m_doc */
	-1, /* m_size */
	functions, /* m_methods */
	};

it seems simpler to just use the member names directly.

static PyModuleDef module_def = {
    PyModuleDef_HEAD_INIT,
    .m_name = "_imaging",
    .m_size = -1,
    .m_methods = functions,
};