build: add -Wdeclaration-after-statement

Now that all the users have been converted or silenced,
let's enable this warning.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
60 jobs for warn in 26 minutes and 5 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Containers
passed #668766485
aarch64-debian-10-container

00:01:28

passed #668766498
aarch64-debian-sid-container

00:01:26

passed #668766486
armv6l-debian-10-container

00:01:29

passed #668766499
armv6l-debian-sid-container

00:01:30

passed #668766488
armv7l-debian-10-container

00:01:27

passed #668766501
armv7l-debian-sid-container

00:01:33

passed #668766489
i686-debian-10-container

00:01:29

passed #668766504
i686-debian-sid-container

00:01:35

passed #668766513
mingw32-fedora-rawhide-container

00:01:36

passed #668766515
mingw64-fedora-rawhide-container

00:01:38

passed #668766491
mips-debian-10-container

00:01:26

passed #668766492
mips64el-debian-10-container

00:01:26

passed #668766506
mips64el-debian-sid-container

00:01:30

passed #668766494
mipsel-debian-10-container

00:01:25

passed #668766509
mipsel-debian-sid-container

00:01:35

passed #668766495
ppc64le-debian-10-container

00:01:28

passed #668766510
ppc64le-debian-sid-container

00:01:30

passed #668766496
s390x-debian-10-container

00:01:26

passed #668766512
s390x-debian-sid-container

00:01:28

passed #668766460
x64-centos-7-container

00:01:24

passed #668766464
x64-centos-8-container

00:01:33

passed #668766465
x64-centos-stream-container

00:01:43

passed #668766469
x64-debian-10-container

00:01:28

passed #668766470
x64-debian-sid-container

00:01:30

passed #668766474
x64-fedora-31-container

00:01:40

passed #668766477
x64-fedora-32-container

00:01:38

passed #668766478
x64-fedora-rawhide-container

00:01:37

passed #668766479
x64-opensuse-151-container

00:01:34

passed #668766482
x64-ubuntu-1804-container

00:01:26

passed #668766483
x64-ubuntu-2004-container

00:01:29

 
  Builds
passed #668766537
aarch64-debian-10

00:12:37

passed #668766533
armv6l-debian-10

00:12:24

passed #668766534
armv7l-debian-10

00:11:38

passed #668766545
codestyle

00:02:19

passed #668766540
i686-debian-sid

00:12:09

passed #668766542
mingw32-fedora-rawhide

00:06:14

passed #668766543
mingw64-fedora-rawhide

00:07:15

passed #668766536
mips-debian-10

00:11:58

passed #668766535
mips64el-debian-10

00:12:57

passed #668766538
mipsel-debian-10

00:13:13

passed #668766541
ppc64le-debian-sid

00:15:42

passed #668766539
s390x-debian-sid

00:11:34

passed #668766544
website

00:02:02

passed #668766520
x64-centos-7

00:10:29

passed #668766521
x64-centos-8

00:14:28

passed #668766522
x64-centos-8-clang

00:13:40

passed #668766523
x64-centos-stream

00:14:18

passed #668766517
x64-debian-10

00:14:15

passed #668766518
x64-debian-10-clang

00:10:19

passed #668766519
x64-debian-sid

00:15:44

passed #668766524
x64-fedora-31

00:13:44

passed #668766525
x64-fedora-32

00:15:42

passed #668766526
x64-fedora-rawhide

00:15:06

passed #668766527
x64-fedora-rawhide-clang

00:14:04

passed #668766531
x64-freebsd-12-build

00:26:01

passed #668766532
x64-macos-1015-build

00:06:05

passed #668766528
x64-opensuse-151

00:13:40

passed #668766529
x64-ubuntu-1804

00:13:40

passed #668766530
x64-ubuntu-2004

00:15:01

 
  Sanity Checks
passed #668766546
check-dco

00:00:34