Auto merge of #2854 - pabigot:pabigot/20220729a, r=JohnTitor

linux: add TFD_TIMER_CANCEL_ON_SET constant

This constant was added in Linux v3.0 and glibc 2.26.

Author: bors

libc-test/semver/linux.txt

@@ -2452,6 +2452,7 @@ TCXONC
 TFD_CLOEXEC
 TFD_NONBLOCK
 TFD_TIMER_ABSTIME
+TFD_TIMER_CANCEL_ON_SET
 THOUSEP
 TIMER_ABSTIME
 TIOCCONS

src/unix/linux_like/linux/mod.rs

@@ -1811,6 +1811,7 @@ pub const ITIMER_PROF: ::c_int = 2;
 pub const TFD_CLOEXEC: ::c_int = O_CLOEXEC;
 pub const TFD_NONBLOCK: ::c_int = O_NONBLOCK;
 pub const TFD_TIMER_ABSTIME: ::c_int = 1;
+pub const TFD_TIMER_CANCEL_ON_SET: ::c_int = 2;
 
 pub const _POSIX_VDISABLE: ::cc_t = 0;