[vala] (20 commits) Non-fast-forward update to branch wip/ci

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/ci' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  344e4dd... coverage: Build gidl-bindings
  715b226... ci: Add .gitlab-ci.yml
  7339004... ci: Add ubuntu:16.04 run with gcc
  8244593... ci: Add archlinux:latest run with gcc
  cf39333... ci: Pin archlinux before glibc bump
  d85b85c... ci: Add alpine:edge run with gcc
  47d34ea... ci: Add fedora:rawhide run with clang
  58814fe... Fedora rawhide is broken
  393b17a... ci: Always deploy

Commits added to the branch:

  321fd98... codegen: Fix default value of get_ccode_destroy_notify_pos( (*)
  e2edf1f... codegen: Always use CCodeConstant for NULL (*)
  ba1231c... codegen: Don't override valid target/destroy of previous la (*)
  df6abd2... pixman-1: Fix some bindings errors (*)
  cafa826... zlib: Fix some bindings errors (*)
  6cf363b... x11: Fix some bindings errors (*)
  eeb6729... libusb-1.0: Fix some bindings errors (*)
  959594d... libusb: Fix some bindings errors (*)
  50cbf91... codegen: Don't call *_instance_init() in compact class chai (*)
  b5f4bf0... tests: Extend "this chainup in compact class" test (*)
  f5203f7... Release 0.52.1 (*)
  12bdbb8... coverage: Build gidl-bindings
  36f63ba... ci: Add .gitlab-ci.yml
  d953de5... ci: Add ubuntu:16.04 run with gcc
  36af9fe... ci: Add archlinux:latest run with gcc
  482aca0... ci: Pin archlinux before glibc bump
  1ac22be... ci: Add alpine:edge run with gcc
  ec2584a... ci: Add fedora:rawhide run with clang
  32cdec2... Fedora rawhide is broken
  d5e89a1... ci: Always deploy

(*) This commit already existed in another branch; no separate mail sent