[vala] (17 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:

  1a7898a... coverage: Build gidl-bindings
  d9a34b2... ci: Add .gitlab-ci.yml
  e003125... ci: Add ubuntu:16.04 run with gcc
  d66b5d8... ci: Add ubuntu:18.04 run with gcc
  a7ed587... ci: Add fedora:latest run with clang
  7154adf... ci: Add archlinux/base:latest run with gcc
  825908d... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  242fb35... ci: Always deploy

Commits added to the branch:

  a5c3c6c... codegen: Avoid symbol clashes with "va_*" from "stdarg.h" (*)
  bca593b... Release 0.48.1 (*)
  b893c03... glib-2.0: Add binding for g_poll() (*)
  979ef7c... vapigen: Define "GOBJECT" corresponding to set profile of C (*)
  5490b0b... codegen: Reset outdated array _size_ variable after use as  (*)
  4555ed6... codegen: Emit postconditions before free'ing local variable (*)
  c12529b... codegen: Correctly access captured parameter in preconditio (*)
  d7c6af7... cairo: Add missing type_id attributes guarded by GOBJECT de (*)
  0a9771d... vapi: Add cairo-gobject binding (*)
  65f6c00... coverage: Build gidl-bindings
  3ac8b2c... ci: Add .gitlab-ci.yml
  b607847... ci: Add ubuntu:16.04 run with gcc
  e920a9b... ci: Add ubuntu:18.04 run with gcc
  9fd77f1... ci: Add fedora:latest run with clang
  31b3315... ci: Add archlinux/base:latest run with gcc
  9ac2ab4... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  4838a60... ci: Always deploy

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