translate_c fails on flexible arrays in structs

[ifreund]

The following code fails to translate due to the flexible array in the struct.

struct wlr_drm_format {
	uint32_t format;
	size_t len, cap;
	uint64_t modifiers[];
};

This was discovered when trying to @cImport() headers from wlroots, code snippet taken from here

[ifreund]

Closing as duplicate of #8759