[vala] (14 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:

  e393d57... coverage: Build gidl-bindings
  d9b4689... ci: Add .gitlab-ci.yml
  289631c... ci: Add ubuntu:16.04 run with gcc
  08fa7f1... ci: Add ubuntu:18.04 run with gcc
  f7cb72d... ci: Add fedora:latest run with clang
  84c3a3e... ci: Add archlinux/base:latest run with gcc
  8d8319c... ci: Always deploy

Commits added to the branch:

  9792611... vala: Replace if-else-tree with switch in UnaryExpression.c (*)
  73dfbd9... vala: Replace if-else-tree with switch in BinaryExpression. (*)
  7db6bc9... codegen: Replace if-else-tree with switch in CCodeBaseModul (*)
  683ee16... vala: Use private argument_list field instead of get_argume (*)
  d392d3d... codegen: ErrorType is not a Symbol (*)
  f3f466b... tests: Add "wrongly named constructor" tests (*)
  40dbdc2... glib-2.0: Add new symbols from 2.64 (*)
  44a3dd9... coverage: Build gidl-bindings
  c7585ef... ci: Add .gitlab-ci.yml
  024f55b... ci: Add ubuntu:16.04 run with gcc
  67860de... ci: Add ubuntu:18.04 run with gcc
  b2e7f15... ci: Add fedora:latest run with clang
  ff226e1... ci: Add archlinux/base:latest run with gcc
  6b2e99d... ci: Always deploy

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