update to the latest vertex fetch proposal

The main difference is that XGL_SLOT_VERTEX_INPUT is replaced by
xglCmdBindVertexData.  This actually simplifies the driver, which can be seen
with:

 $ git show icd/intel/

The new proposal also adds some new formats, but they are ignored for now
because they are marked TBD.
diff --git a/layers/draw_state.c b/layers/draw_state.c
index 89f0f04..8a2e4c7 100644
--- a/layers/draw_state.c
+++ b/layers/draw_state.c
@@ -354,10 +354,6 @@
             if (MAPPING_SAMPLER != slotBinding)
                 error = XGL_TRUE;
             break;
-        case XGL_SLOT_VERTEX_INPUT:
-            if (MAPPING_MEMORY != slotBinding)
-                error = XGL_TRUE;
-            break;
         case XGL_SLOT_SHADER_UAV:
             if (MAPPING_MEMORY != slotBinding)
                 error = XGL_TRUE;
@@ -602,6 +598,8 @@
     nextTable.CmdBindDescriptorSet = fpCmdBindDescriptorSet;
     CmdBindDynamicMemoryViewType fpCmdBindDynamicMemoryView = fpNextGPA((XGL_PHYSICAL_GPU) pCurObj->nextObject, (XGL_CHAR *) "xglCmdBindDynamicMemoryView");
     nextTable.CmdBindDynamicMemoryView = fpCmdBindDynamicMemoryView;
+    CmdBindVertexDataType fpCmdBindVertexData = fpNextGPA((XGL_PHYSICAL_GPU) pCurObj->nextObject, (XGL_CHAR *) "xglCmdBindVertexData");
+    nextTable.CmdBindVertexData = fpCmdBindVertexData;
     CmdBindIndexDataType fpCmdBindIndexData = fpNextGPA((XGL_PHYSICAL_GPU) pCurObj->nextObject, (XGL_CHAR *) "xglCmdBindIndexData");
     nextTable.CmdBindIndexData = fpCmdBindIndexData;
     CmdBindAttachmentsType fpCmdBindAttachments = fpNextGPA((XGL_PHYSICAL_GPU) pCurObj->nextObject, (XGL_CHAR *) "xglCmdBindAttachments");
@@ -1248,6 +1246,11 @@
     nextTable.CmdBindDynamicMemoryView(cmdBuffer, pipelineBindPoint, pMemView);
 }
 
+XGL_LAYER_EXPORT XGL_VOID XGLAPI xglCmdBindVertexData(XGL_CMD_BUFFER cmdBuffer, XGL_GPU_MEMORY mem, XGL_GPU_SIZE offset, XGL_UINT binding)
+{
+    nextTable.CmdBindVertexData(cmdBuffer, mem, offset, binding);
+}
+
 XGL_LAYER_EXPORT XGL_VOID XGLAPI xglCmdBindIndexData(XGL_CMD_BUFFER cmdBuffer, XGL_GPU_MEMORY mem, XGL_GPU_SIZE offset, XGL_INDEX_TYPE indexType)
 {
     nextTable.CmdBindIndexData(cmdBuffer, mem, offset, indexType);