Fix build for the surfaceless and null-WS target platforms

Fix build for the surfaceless and null-WS target platforms

Both platforms should not be considered for building Vulkan Video, which
is only available in the normal Linux and Win32 targets, and their
createLibrary platform methods do not take a library type argument.

No test results should be affected by these changes.

Components: Framework
VK-GL-CTS issue: 4295

Change-Id: I4de5b42685899099a9cfcf7da64fe299fef61ffc