`ioctl` on android is no longer tested.

[mbyx]

Due to migrating to the new ctest which uses void * types to check function addresses in its tests instead of figuring out the exact type of the function, we can no longer test ioctl on android, because ioctl is an overloaded function with two different definitions, and without the exact type the compiler fails to identify which function to point to.

Fixing this would likely require changing the function pointer test back to the more complicated version we had previously, where we specified the type of the function pointer exactly.

This problem first came up in #4675.