Introduce <sys/qmath.h>, a fixed-point math library from Netflix.
It has no dependencies and can be used from both userspace
and the kernel. For a general description of the idea, see
https://en.wikipedia.org/wiki/Q_%28number_format%29; for
the actual API see the qmath(3) man page.
This is one of dependencies for the stats(3) framework.
Sponsored By: Klara Inc, Netflix
Obtained from: Netflix