FindVulkan: Restore tolerance of unknown FATAL_ERROR component
find_package(Vulkan REQUIRED FATAL_ERROR)
calls exist in the wild, but
find_package
does not have a FATAL_ERROR
option. We silently
tolerated such calls prior to !7225 (merged), by
treating the argument as a component and ignoring it. Restore tolerance
by removing the component and warning about it.
Fixes: #23849 (closed)
Backport: release