nvidia_x11: install optimus ICDs

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Now Vulkan part works. No idea what is wrong with OpenGL

$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=NVIDIA_only vulkaninfo | fgrep 'GPU id'
                GPU id       : 0 (GeForce MX150)
                GPU id       : 0 (GeForce MX150)
                GPU id       : 0 (GeForce MX150)
                GPU id       : 0 (GeForce MX150)
                GPU id       : 0 (GeForce MX150)
                GPU id       : 0 (GeForce MX150)
GPU id       : 0 (GeForce MX150)
GPU id       : 0 (GeForce MX150)

$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=non_NVIDIA_only vulkaninfo | fgrep 'GPU id'
INTEL-MESA: warning: ../src/intel/vulkan/anv_device.c:1504: FINISHME: Implement pop-free point clipping
                GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
                GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
                GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
                GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
                GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
                GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))
GPU id       : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2))

Both work fine. Background is different so its easy to distinct these two

$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=NVIDIA_only vkcube
$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=non_NVIDIA_only vkcube

That worked too. I'm not sure why nvidia is darker...

$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=NVIDIA_only vkquake -basedir /tmp/quake
$ __NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=non_NVIDIA_only vkquake -basedir /tmp/quake

Loaded

Fri Sep  6 22:21:50 2019       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 435.21       Driver Version: 435.21       CUDA Version: 10.1     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce MX150       Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   45C    P0    N/A /  N/A |    154MiB /  2002MiB |     32%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0      1086      G   ...gbim0idpi4fn42-xorg-server-1.20.5/bin/X    80MiB |
|    0     12692    C+G   /home/gnidorah/.nix-profile/bin/vkquake        63MiB |
|    0     13347    C+G   vkcube                                        10MiB |
+-----------------------------------------------------------------------------+

Idle

Fri Sep  6 22:23:07 2019       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 435.21       Driver Version: 435.21       CUDA Version: 10.1     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce MX150       Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   45C    P8    N/A /  N/A |     46MiB /  2002MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0      1086      G   ...gbim0idpi4fn42-xorg-server-1.20.5/bin/X    46MiB |
+-----------------------------------------------------------------------------+

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cc @eadwu

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@eadwu Thank you!