[dconf] (21 commits) ...Merge branch 'meson' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  af3f39d... build: Rename build options
  e73979a... build: Remove macro definition
  e5f8af8... build: Remove default options
  082a10c... build: Use get_supported_arguments helper
  9f0651c... build: Retrieve D-Bus and gio paths from pkg-config files
  9ce9c03... build: Remove config.h definitions
  183e193... build: Avoid building libraries twice
  c50f375... build: Fix internal dependencies
  48b88c3... build: Remove unnecessary variables
  d592c51... build: Use gnome's gtkdoc_html_dir function
  dcafaf7... build: Fix parameters order
  53099b7... build: Fix pkg-config exec_prefix variable
  2a99700... build: Remove duplicated warning parameter
  09e7dae... build: Use completions dir from pkg-config file
  14d49e6... build: Use vapi dir from pkg-config file
  4ef809a... build: Simplified checking compiler supported arguments
  11085f9... build: Do not make heavy use of project_name
  76f60f4... build: Add trailing commas where necessary
  0dba400... build: Simplified pkg-config file generation
  6fcde2e... tests: Add libdbus-1-dev and bash-completion packages
  20223ed... Merge branch 'meson' into 'master'