silence "missing print.h" warning

(cherry picked from commit 3c18b7d3)
14 jobs for silence-warning-v9_12 in 9 minutes and 50 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Precheck
passed precheck:debian:sid:amd64 #49729
amd64 docker linux

00:00:18

 
  Build
passed build:centos:centos6:amd64 #49730
amd64 docker linux

00:02:55

passed build:centos:centos7:amd64 #49731
amd64 docker linux

00:03:25

passed build:debian:sid:amd64 #49732
amd64 docker linux

00:02:58

passed build:debian:sid:i386 #49733
i386 docker linux

00:02:49

 
  Test
passed install:debian:sid:amd64 #49742
amd64 docker linux

00:03:28

passed systemtest:centos:centos6:amd64 #49738
amd64 docker linux

00:05:19

passed systemtest:centos:centos7:amd64 #49739
amd64 docker linux

00:05:51

passed systemtest:debian:sid:amd64 #49740
amd64 docker linux

00:05:08

passed systemtest:debian:sid:i386 #49741
i386 docker linux

00:06:06

passed unittest:centos:centos6:amd64 #49734
amd64 docker linux

00:00:57

passed unittest:centos:centos7:amd64 #49735
amd64 docker linux

00:01:01

passed unittest:debian:sid:amd64 #49736
amd64 docker linux

00:01:01

passed unittest:debian:sid:i386 #49737
i386 docker linux

00:00:57