Use libimobiledevice idevice_connection_get_fd

[cfal]

This fixes build with latest libimobiledevice.

libimobiledevice now provides a way to get the fd with the same function name idevice_connection_get_fd. Use the provided function instead.

libimobiledevice commit

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[cfal]

Signed

[googlebot]

CLAs look good, thanks!

[artygus]

@cfal thanks for contribution, looks good!