Import upstream patch to fix build on i386:

/wrkdirs/usr/ports/emulators/dolphin-emu/work/dolphin-3152428/Source/Core/VideoBackends/Vulkan/VKTexture.h:57:51: error: invalid operands to binary expression ('const VkDeviceMemory' (aka 'const unsigned long long') and 'nullptr_t')

bool IsAdopted() const { return m_device_memory != nullptr; }
                                ~~~~~~~~~~~~~~~ ^  ~~~~~~~