include build dir before VulkanHeaders_INCLUDE_DIR

Index: layers/CMakeLists.txt
--- layers/CMakeLists.txt.orig
+++ layers/CMakeLists.txt
@@ -107,7 +107,7 @@ macro(AddVkLayer target LAYER_COMPILE_DEFINITIONS)
     install(TARGETS VkLayer_${target} DESTINATION ${CMAKE_INSTALL_LIBDIR})
 endmacro()
 
-include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/generated ${VulkanHeaders_INCLUDE_DIR})
+include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${PROJECT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/generated ${VulkanHeaders_INCLUDE_DIR})
 
 if(MSVC)
     # Applies to all configurations
