util/u_thread: Check for pthread_getcpuclockid.
pthread_getcpuclockid is not available on macOS.
Fixes: 4913215d ("util/u_thread: don't restrict u_thread_get_time_nano() to linux") Signed-off-by: Vinson Lee vlee@freedesktop.org
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pthread_getcpuclockid is not available on macOS.
Fixes: 4913215d ("util/u_thread: don't restrict u_thread_get_time_nano() to linux") Signed-off-by: Vinson Lee vlee@freedesktop.org