Revert "DrawManager: Use Compute Shader to Update Hair."

This reverts commit 8f9599d17e80254928d2d72081a4c7e0dee64038.

Mac seems to have an error with this change.
```
                 ERROR: /Users/blender/git/blender-vdev/blender.git/source/blender/draw/intern/draw_hair.c:115:44: error: use of undeclared identifier 'shader_src'
                 ERROR: /Users/blender/git/blender-vdev/blender.git/source/blender/draw/intern/draw_hair.c:123:13: error: use of undeclared identifier 'shader_src'
                 ERROR: make[2]: *** [source/blender/draw/CMakeFiles/bf_draw.dir/intern/draw_hair.c.o] Error 1
                 ERROR: make[1]: *** [source/blender/draw/CMakeFiles/bf_draw.dir/all] Error 2
                 ERROR: make: *** [all] Error 2

```

4 files changed, 0 insertions, 22 deletions

diff --git a/source/blender/gpu/GPU_capabilities.h b/source/blender/gpu/GPU_capabilities.h
index 0c054d4f264..45c656b49be 100644
--- a/source/blender/gpu/GPU_capabilities.h
+++ b/source/blender/gpu/GPU_capabilities.h
@@ -37,8 +37,6 @@ int GPU_max_textures(void);
 int GPU_max_textures_vert(void);
 int GPU_max_textures_geom(void);
 int GPU_max_textures_frag(void);
-int GPU_max_work_group_count(int index);
-int GPU_max_work_group_size(int index);
 int GPU_max_uniforms_vert(void);
 int GPU_max_uniforms_frag(void);
 int GPU_max_batch_indices(void);
diff --git a/source/blender/gpu/intern/gpu_capabilities.cc b/source/blender/gpu/intern/gpu_capabilities.cc
index c6e9dc210cb..bedc9ad3092 100644
--- a/source/blender/gpu/intern/gpu_capabilities.cc
+++ b/source/blender/gpu/intern/gpu_capabilities.cc
@@ -82,16 +82,6 @@ int GPU_max_textures(void)
   return GCaps.max_textures;
 }
 
-int GPU_max_work_group_count(int index)
-{
-  return GCaps.max_work_group_count[index];
-}
-
-int GPU_max_work_group_size(int index)
-{
-  return GCaps.max_work_group_size[index];
-}
-
 int GPU_max_uniforms_vert(void)
 {
   return GCaps.max_uniforms_vert;
diff --git a/source/blender/gpu/intern/gpu_capabilities_private.hh b/source/blender/gpu/intern/gpu_capabilities_private.hh
index 95cf7fd335d..ee7ef1e69e6 100644
--- a/source/blender/gpu/intern/gpu_capabilities_private.hh
+++ b/source/blender/gpu/intern/gpu_capabilities_private.hh
@@ -41,8 +41,6 @@ struct GPUCapabilities {
   int max_textures_vert = 0;
   int max_textures_geom = 0;
   int max_textures_frag = 0;
-  int max_work_group_count[3] = {0, 0, 0};
-  int max_work_group_size[3] = {0, 0, 0};
   int max_uniforms_vert = 0;
   int max_uniforms_frag = 0;
   int max_batch_indices = 0;
diff --git a/source/blender/gpu/opengl/gl_backend.cc b/source/blender/gpu/opengl/gl_backend.cc
index d85f9f7684d..fb03a2c2d2a 100644
--- a/source/blender/gpu/opengl/gl_backend.cc
+++ b/source/blender/gpu/opengl/gl_backend.cc
@@ -438,14 +438,6 @@ void GLBackend::capabilities_init()
   GCaps.mem_stats_support = GLEW_NVX_gpu_memory_info || GLEW_ATI_meminfo;
   GCaps.shader_image_load_store_support = GLEW_ARB_shader_image_load_store;
   GCaps.compute_shader_support = GLEW_ARB_compute_shader;
-  if (GCaps.compute_shader_support) {
-    glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_COUNT, 0, &GCaps.max_work_group_count[0]);
-    glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_COUNT, 1, &GCaps.max_work_group_count[1]);
-    glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_COUNT, 2, &GCaps.max_work_group_count[2]);
-    glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_SIZE, 0, &GCaps.max_work_group_size[0]);
-    glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_SIZE, 1, &GCaps.max_work_group_size[1]);
-    glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_SIZE, 2, &GCaps.max_work_group_size[2]);
-  }
   GCaps.shader_storage_buffer_objects_support = GLEW_ARB_shader_storage_buffer_object;
   /* GL specific capabilities. */
   glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE, &GLContext::max_texture_3d_size);