[grilo] (6 commits) Non-fast-forward update to branch ebassi/subproject-variables

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'ebassi/subproject-variables' 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:

  9ebe321... build: Let Meson fill out the pkg-config directories
  9326349... tools: Clean up the core keys generator script
  04353b6... build: Don't check for Python 2
  08cba17... tools: Avoid a deprecation warning with newer GLib
  fe56232... build: Use copy argument for configure_file()
  c526364... build: Declare a variable for the internal grlnet dependenc

Commits added to the branch:

  ba7d322... build: Let Meson fill out the pkg-config directories
  2e53277... tools: Clean up the core keys generator script
  1de4a96... build: Don't check for Python 2
  adceeaa... tools: Avoid a deprecation warning with newer GLib
  6da3840... build: Use copy argument for configure_file()
  ca5d6c8... build: Declare a variable for the internal grlnet dependenc