Py API Docs: Fix audio docs example

After new AUD API changes from 2.8x what "buffer" function used to do
has now become "cache" function (it caches a sound into RAM). Therefore,
the basic aud example should call this new "cache" function instead of
"buffer" function.

Thanks to Michael-Z-Freeman for pointing out.

Py API Docs: Fix audio docs example

After new AUD API changes from 2.8x what "buffer" function used to do
has now become "cache" function (it caches a sound into RAM). Therefore,
the basic aud example should call this new "cache" function instead of
"buffer" function.

Thanks to Michael-Z-Freeman for pointing out.

Cleanup: correct mul_v4_v4fl declaration

Fix T57059: "make deps" build error when sndio library is present.

CMake: Remove MOTO library dependency when it is not needed

It is not necessary to add MOTO library dependency when we use
WITH_IK_SOLVER (now it uses Eigen) or we use WITH_MOD_BOOLEAN (it was
used by bsp intern library some time ago but it is not present in the
code anymore).

Reviewers: mont29, sergey

Subscribers: mont29, sergey

Differential Revision: https://developer.blender.org/D2477

BGE Ketsji clean-up: double-promotion warnings

BGE clean up: use float version of trigonometric functions

BGE Scenegraph clean up: double-promotion warnings

BGE Physics clean up: double-promotion warnings

BGE Rasterizer clean up: double-promotion warnings