/usr/include/diet/termio.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | /* this looks horribly wrong, but glibc does it like that */
#include <termios.h>
#include <sys/ioctl.h>
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