[gjs] (6 commits) ...Merge remote-tracking branch 'origin/wip/jtojnar/nixos-fixes'

[Philip Chimento <pchimento src gnome org>]

Summary of changes:

  14bae0e... vuild: Pass schemadir to compile-gschemas.py (*)
  075f015... build: Use more traditional installed-tests variables (*)
  5cfd2c2... build: Make installed tests vars absolute (*)
  1a81f40... build: Use installed_tests_execdir in the .test files (*)
  361a319... build: Install test libraries under installed_tests_execdir (*)
  e782ff8... Merge remote-tracking branch 'origin/wip/jtojnar/nixos-fixe

(*) This commit already existed in another branch; no separate mail sent