loader: Update SOVERSION to version 1.0.31
loader: Update SOVERSION to version 1.0.31

Change-Id: If2e6d7dee62d03cfc95bebd8418c53bceef6fc22

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers