FreeBSD: add Linux-compatible clock aliases

They were added in https://reviews.freebsd.org/D30988 which landed for 13,
but as they're just aliases, they will work on any version.

Author: valpackett

libc-test/build.rs

@@ -2082,6 +2082,14 @@ fn test_freebsd(target: &str) {
                 true
             }
 
+            // These aliases were introduced in FreeBSD 13:
+            // (note however that the constants themselves work on any version)
+            "CLOCK_BOOTTIME" | "CLOCK_REALTIME_COARSE" | "CLOCK_MONOTONIC_COARSE"
+                if Some(13) > freebsd_ver =>
+            {
+                true
+            }
+
             // FIXME: These are deprecated - remove in a couple of releases.
             // These constants were removed in FreeBSD 11 (svn r273250) but will
             // still be accepted and ignored at runtime.

libc-test/semver/freebsd.txt

@@ -149,10 +149,13 @@ CLD_EXITED
 CLD_KILLED
 CLD_STOPPED
 CLD_TRAPPED
+CLOCK_BOOTTIME
+CLOCK_MONOTONIC_COARSE
 CLOCK_MONOTONIC_FAST
 CLOCK_MONOTONIC_PRECISE
 CLOCK_PROCESS_CPUTIME_ID
 CLOCK_PROF
+CLOCK_REALTIME_COARSE
 CLOCK_REALTIME_FAST
 CLOCK_REALTIME_PRECISE
 CLOCK_SECOND

src/unix/bsd/freebsdlike/mod.rs

@@ -824,12 +824,15 @@ pub const CLOCK_VIRTUAL: ::clockid_t = 1;
 pub const CLOCK_PROF: ::clockid_t = 2;
 pub const CLOCK_MONOTONIC: ::clockid_t = 4;
 pub const CLOCK_UPTIME: ::clockid_t = 5;
+pub const CLOCK_BOOTTIME: ::clockid_t = CLOCK_UPTIME;
 pub const CLOCK_UPTIME_PRECISE: ::clockid_t = 7;
 pub const CLOCK_UPTIME_FAST: ::clockid_t = 8;
 pub const CLOCK_REALTIME_PRECISE: ::clockid_t = 9;
 pub const CLOCK_REALTIME_FAST: ::clockid_t = 10;
+pub const CLOCK_REALTIME_COARSE: ::clockid_t = CLOCK_REALTIME_FAST;
 pub const CLOCK_MONOTONIC_PRECISE: ::clockid_t = 11;
 pub const CLOCK_MONOTONIC_FAST: ::clockid_t = 12;
+pub const CLOCK_MONOTONIC_COARSE: ::clockid_t = CLOCK_MONOTONIC_FAST;
 pub const CLOCK_SECOND: ::clockid_t = 13;
 pub const CLOCK_THREAD_CPUTIME_ID: ::clockid_t = 14;
 pub const CLOCK_PROCESS_CPUTIME_ID: ::clockid_t = 15;