[gnome-build-meta] (14 commits) ....gitlab-ci.yml: build flatpak runtimes

[Javier Jardón Cabezas <jjardon src gnome org>]

Summary of changes:

  43aed46... core-deps/vala-tarball: use LTS version (*)
  0133fe1... move elements in the flatpak runtime and sdk to sdk/ (*)
  2c3f5f7... generate flatpak runtimes (*)
  9dab061... sdk: elements in sdk-platform.bst should not runtime-depend (*)
  1da009b... add dependencies on gtk-doc, vala and gnome-common to eleme (*)
  2df1634... project.conf: add default split-rules (*)
  5861718... project.conf: install everything in /usr (*)
  55e8459... project.conf: set the debug directory to /usr/lib/debug (*)
  8398e1c... sdk: make dependencies on elements from org.freedesktop.Bas (*)
  83b20c2... sdk/os-release: import from gnome-sdk-images (*)
  8bcde46... sdk/: build sdl2 ourselves (*)
  8b00250... sdk{-platform}: add (almost) everything from freedesktop-sd (*)
  d593c0d... project.conf: import rules for stripping binaries from free (*)
  9751cd5... .gitlab-ci.yml: build flatpak runtimes (*)

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