vulkan: make VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT conditional

Only advertise VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT if CLOCK_MONOTONIC_RAW
is defined.  Fixes the build on OpenBSD which has CLOCK_MONOTONIC but not
CLOCK_MONOTONIC_RAW.

Fixes: 67a2c1493c0 ("vulkan: Add VK_EXT_calibrated_timestamps extension (radv and anv) [v5]")
Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6517>
2 files changed