Revert "Fix: EEVEE: Write to vertex shader outputs to avoid Intel linking errors"

This reverts commit 16ad7524a7.
The commit was accidentally pushed to the upstream branch instead of a
fork branch.

source/blender/draw/engines/eevee/shaders/eevee_geom_volume_vert.glsl

@@ -28,12 +28,4 @@ void main()
   interp.P = drw_point_object_to_world(lP);
 
   gl_Position = reverse_z::transform(drw_point_world_to_homogenous(interp.P));
-
-#ifdef MAT_SHADOW
-  /* Volumes currently do not support shadow. But the shader validation pipeline still compiles the
-   * shadow variant of this shader. Avoid linking error on Intel Windows drivers. */
-  shadow_iface.shadow_view_id = 0;
-  shadow_clip.position = float3(0);
-  shadow_clip.vector = float3(0);
-#endif
 }

source/blender/draw/engines/eevee/shaders/eevee_geom_world_vert.glsl

@@ -29,12 +29,4 @@ void main()
   interp.N = float3(1);
 
   gl_Position = reverse_z::transform(gl_Position);
-
-#ifdef MAT_SHADOW
-  /* This shader currently does not support shadow. But the shader validation pipeline still
-   * compiles the shadow variant of this shader. Avoid linking error on Intel Windows drivers. */
-  shadow_iface.shadow_view_id = 0;
-  shadow_clip.position = float3(0);
-  shadow_clip.vector = float3(0);
-#endif
 }