Fix <strings.h> include statement in multisampling.cpp.
Fix <strings.h> include statement in multisampling.cpp.

SaschaWillems/Vulkan,SaschaWillems/Vulkan,grim210/Vulkan,jpbruyere/Vulkan,ming4883/Vulkan,SaschaWillems/Vulkan,grim210/Vulkan,ming4883/Vulkan,jpbruyere/Vulkan,ming4883/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan