[devhelp] (3 commits) Non-fast-forward update to branch wip/swilmet/build-system-update

[Sébastien Wilmet <swilmet src gnome org>]

The branch 'wip/swilmet/build-system-update' 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:

  7267b25... build: don't use gnome-autogen.sh (deprecated)
  1bb57d2... build: depend on Automake >= 1.14
  ab9b0db... build: have only one PKG_CHECK_MODULES

Commits added to the branch:

  f3542eb... build: don't use gnome-autogen.sh (deprecated)
  0512140... build: depend on Automake >= 1.14
  6773f32... build: have only one PKG_CHECK_MODULES