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Enable equirect extension.
Disable old sky layer.
Use new equirect texture.

Fixes compilation error on ubuntu 18.04.

In file included from ../src/pipeline_gears.cpp:13:
In file included from ../src/pipeline_gears.hpp:15:
In file included from ../src/gear.hpp:14:
In file included from ../src/glm_inc.hpp:18:
In file included from /usr/include/glm/gtx/string_cast.hpp:23:
In file included from /usr/include/glm/gtx/../gtx/dual_quaternion.hpp:274:
/usr/include/glm/gtx/dual_quaternion.inl:31:20: error: use of undeclared identifier 'P'
                        : real(tquat<T, P>())
                                        ^
/usr/include/glm/gtx/dual_quaternion.inl:32:20: error: use of undeclared identifier 'P'
                        , dual(tquat<T, P>(0, 0, 0, 0))
                                        ^

Use C++2a to get designated struct initializers for C++.

We usually expect runtimes to acquire the same image index for every
swapchain, though there is no guarantee for this.

Fixes shading.

Fixes gears alpha rendering in Monado.

Hardcode extensions required by SteamVR.
Fixes crash in SteamVR.

Be aware of destination layouts and fix usage.