report "$CC --version" output as part of the configure summary

(cherry picked from commit a6f43574)
14 jobs for report-compiler-version-v9_12 in 7 minutes and 51 seconds (queued for 13 seconds)
Status Job ID Name Coverage
  Precheck
passed #56132
amd64 docker linux
precheck:debian:sid:amd64

00:00:18

 
  Build
passed #56133
amd64 docker linux
build:centos:centos6:amd64

00:02:23

passed #56134
amd64 docker linux
build:centos:centos7:amd64

00:02:32

passed #56135
amd64 docker linux
build:debian:sid:amd64

00:01:45

passed #56136
i386 docker linux
build:debian:sid:i386

00:01:20

 
  Test
passed #56145
amd64 docker linux
install:debian:sid:amd64

00:01:57

passed #56141
amd64 docker linux
systemtest:centos:centos6:amd64

00:04:42

passed #56142
amd64 docker linux
systemtest:centos:centos7:amd64

00:04:38

passed #56143
amd64 docker linux
systemtest:debian:sid:amd64

00:04:44

passed #56144
i386 docker linux
systemtest:debian:sid:i386

00:04:58

passed #56137
amd64 docker linux
unittest:centos:centos6:amd64

00:00:50

passed #56138
amd64 docker linux
unittest:centos:centos7:amd64

00:01:06

passed #56139
amd64 docker linux
unittest:debian:sid:amd64

00:00:59

passed #56140
i386 docker linux
unittest:debian:sid:i386

00:00:56