Backends: Vulkan: Fix building with VK_NO_PROTOTYPES. (#914, #5738).
Backends: Vulkan: Fix building with VK_NO_PROTOTYPES. (#914, #5738).

Amend a588f00

nProtect/imgui,ocornut/imgui,ocornut/imgui,bkaradzic/imgui,bkaradzic/imgui,nProtect/imgui,ocornut/imgui,nProtect/imgui,bkaradzic/imgui