Marked for deprecation in the future. Use PlayerSettings.meshDeformation instead.
If you change the value of gpuSkinning, Unity sets PlayerSettings.meshDeformation in the following way:
If you set gpuSkinning to false, Unity sets PlayerSettings.meshDeformation to MeshDeformation.CPU.
If you set gpuSkinning to true, Unity sets PlayerSettings.meshDeformation to MeshDeformation.GPUBatched.
See PlayerSettings.meshDeformation.