[vala] (16 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:

  24c50ec... coverage: Build gidl-bindings
  247fffe... ci: Add .gitlab-ci.yml
  890e8d0... ci: Add ubuntu:16.04 run with gcc
  d35ac12... ci: Add ubuntu:18.04 run with gcc
  a41c33e... ci: Add fedora:latest run with clang
  30fc2bd... ci: Add archlinux/base:latest run with gcc
  5b9771b... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  14e9e44... ci: Always deploy

Commits added to the branch:

  0d1b684... vala: Rework ReturnStatement.check to handle "current_retur (*)
  a964a0c... vala: Rely on more implementations of Block in SwitchSectio (*)
  fb4ddde... vala: Bail ThrowStatement.get_error_types() if error is set (*)
  169b990... vala: Don't check for unhandled error if error is set on bo (*)
  1f51967... vala: Properly set CodeNode.error when reporting an error ( (*)
  98fd2b1... vala: Don't analyze error-type of errornous catch-clauses (*)
  4f48a27... vala: Handle unavailable type-symbol in Constant.check_cons (*)
  e590725... vala: Skip UsingDirective if error is set (*)
  bf46725... coverage: Build gidl-bindings
  028d08b... ci: Add .gitlab-ci.yml
  7462983... ci: Add ubuntu:16.04 run with gcc
  dcde387... ci: Add ubuntu:18.04 run with gcc
  77d839b... ci: Add fedora:latest run with clang
  bb52992... ci: Add archlinux/base:latest run with gcc
  a6d7078... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  1f8a471... ci: Always deploy

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