[meld] (10 commits) ...Merge branch 'meson-improvements' into 'master'

[Kai Willadsen <kaiw src gnome org>]

Summary of changes:

  c6445f1... build: Limit the profile option
  6adaef6... build: Use / instead of join_paths
  101dd87... build: Reduce the use of directory variables
  8d096e3... build: Do not use prefix on directory variables
  1c2440b... build: Use the schemasdir variable from gio pkg-config file
  456e5cd... build: Improve the use of the byte-compile option
  ee2790b... build: Use dictionaries in configuration_data objects
  bfc1b07... build: Indent meson build files with recommended settings
  244cc8c... build: Use install_man
  92bbb6d... Merge branch 'meson-improvements' into 'master'