[gdk-pixbuf] (8 commits) Non-fast-forward update to branch ebassi/for-master

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'ebassi/for-master' 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:

  d691fcf... Use 'provide' section in libpng wrap file
  5ec479b... Install API reference under $datadir/doc
  6ffbcd4... fixup! Use 'provide' section in libpng wrap file
  8b0df8c... build: Use a dict for pkg-config file variables
  ef69905... build: Use more idiomatic Meson

Commits added to the branch:

  437cc45... Use 'provide' section in libpng wrap file
  6bd142f... Install API reference under $datadir/doc
  f265a94... build: Use a dict for pkg-config file variables
  caa93d9... ci: Update the version of Meson
  0b26bf3... build: Use more idiomatic Meson
  15b678d... build: Handle -Dbuiltin_loaders=none
  03a4cae... Build PNG and JPEG loaders into gdk-pixbuf by default
  5c5ec21... build: Change the default for builtin_loaders