CI: Don't change ownership of source directory

These CI scripts were originally used on Travis-CI, which starts all
builds as an ordinary user that has the ability to become root via `sudo`.
On Gitlab-CI, we don't need that: we start as uid 0, and can do the
whole CI run like that. This also means we get somewhat better test
coverage, because some of our unit tests benefit from being run as uid 0.

The only test coverage we lose by being uid 0 is that
test_pending_fd_timeout() in test/dbus-daemon.c is skipped, because
uid 0 bypasses the limit that's under test there.

.gitlab-ci.yml

@@ -142,8 +142,7 @@ windows amd64 image:
     # compilers
     - export PATH="/usr/lib/ccache:$PATH"
   script:
-    - chown -R user .
-    - runuser -u user ./tools/ci-build.sh
+    - ./tools/ci-build.sh
 
 debian image:
   extends:

tools/ci-install.sh

@@ -406,11 +406,6 @@ if [ "$ci_local_packages" = yes ]; then
                 wget ${mirror}/${filename}
                 tar -C ${dep_prefix} --strip-components=1 -xvf ${filename}
             done
-
-            # limit access rights
-            if [ "$ci_in_docker" = yes ]; then
-                chown -R user "${dep_prefix}"
-            fi
             ;;
     esac
 fi