time-util: assume CLOCK_BOOTTIME always exists

Let's raise our supported baseline a bit: CLOCK_BOOTTIME started to work
with timerfd in kernel 3.15 (i.e. back in 2014), let's require support
for it now.

This will raise our baseline only modestly from 3.13 → 3.15.

1 files changed, 1 insertions, 1 deletions

diff --git a/README b/README
index bbde47fda7..420276eda8 100644
--- a/README
+++ b/README
@@ -30,7 +30,7 @@ LICENSE:
         LGPL-2.1-or-later for all code, exceptions noted in LICENSES/README.md
 
 REQUIREMENTS:
-        Linux kernel >= 3.13
+        Linux kernel >= 3.15
         Linux kernel >= 4.2 for unified cgroup hierarchy support
         Linux kernel >= 4.10 for cgroup-bpf egress and ingress hooks
         Linux kernel >= 4.15 for cgroup-bpf device hook