bug 15038: Need a way to express the total limit of resources per stage

Add maxPerStageResources.

https://cvs.khronos.org/bugzilla/show_bug.cgi?id=15038
diff --git a/include/vulkan/vulkan.h b/include/vulkan/vulkan.h
index b310f45..15e89b5 100644
--- a/include/vulkan/vulkan.h
+++ b/include/vulkan/vulkan.h
@@ -1204,6 +1204,7 @@
     uint32_t                                    maxPerStageDescriptorSampledImages;
     uint32_t                                    maxPerStageDescriptorStorageImages;
     uint32_t                                    maxPerStageDescriptorInputAttachments;
+    uint32_t                                    maxPerStageResources;
     uint32_t                                    maxDescriptorSetSamplers;
     uint32_t                                    maxDescriptorSetUniformBuffers;
     uint32_t                                    maxDescriptorSetUniformBuffersDynamic;