Fixed point version of the libc atan2() routine.
This is a fixed point version of the libc atan2() routine. It computes the
arc tangent of `y / x', but the signs of both arguments are used to
determine the quadrant of the result, and `x' is permitted to be zero. This
function is useful to convert Cartesian coordinates to polar coordinates.
/* Sets `result' to binary angle 64. */
result = fixatan2(itofix(1), 0);
/* Sets `result' to binary angle -109. */
result = fixatan2(itofix(-1), itofix(-2));
/* Fails the assert. */
result = fixatan2(0, 0);
Returns the arc tangent of `y / x' in fixed point binary format angle,
from `-128' to `128'. If both `x' and `y' are zero, returns zero and sets
`errno' to EDOM.
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