Fix OSS CMake build deps (#4198)

Summary:
Pull Request resolved: #4198

Should have seen this coming when I restructured the file hierarchy in #4179
ghstack-source-id: 233252753

Reviewed By: SS-JIA

Differential Revision: D59592073

fbshipit-source-id: 5c2670194ceb5870980c2161c177010736b36249

Author: jorgep31415

backends/vulkan/CMakeLists.txt

@@ -61,6 +61,8 @@ list(APPEND VULKAN_CXX_FLAGS "-DUSE_VULKAN_VOLK")
 # vulkan API files
 
 file(GLOB_RECURSE vulkan_api_cpp ${RUNTIME_PATH}/api/*)
+file(GLOB_RECURSE vulkan_vkapi_cpp ${RUNTIME_PATH}/vk_api/*)
+list(APPEND vulkan_api_cpp ${vulkan_vkapi_cpp})
 list(APPEND vulkan_api_cpp ${VOLK_PATH}/volk.c)
 
 # vulkan ComputeGraph files