headers under /usr/include, not just for the ones in <sys/ioctl.h>.
The generated file includes all headers that seem to define ioctls,
so build errors will probably occur if headers become less self-
sufficient than they are already. This is a feature. Build errors
shall not be fixed by adding more includes here.
Optionally generate a case statement instead of a list of if
statements. This source must be edited to change this. The case
statement should be non-optional. It currently can't be, because
many ioctl numbers are not unique.
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