[libgweather] (14 commits) ...build: Update the compiler warnings

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  718de32... Move GWeatherDb loading out of GWeatherLocation (*)
  cac4e5a... Get the GWeatherDb when getting a timezone (*)
  549bc5e... tests: Make sure we don't leave around temporary directorie (*)
  6bfad6d... tests: Move duplicate units into their own suite (*)
  ed27ed4... tests: Move shared API into a separate file (*)
  229c267... tests: Split off the timezone tests (*)
  6f7b7cb... ci: Store the right generate files as artefacts (*)
  6ba731a... build: Remove unnecessary symbol (*)
  985b010... tests: Move METAR test to its own suite (*)
  fca6bc2... tests: Hide the glib/gstdio.h include (*)
  dbe06e7... tests: Remove unnecessary include directives (*)
  2b78434... tests: Replace a warning with a test message (*)
  161a019... tests: Use private API to access the locations database (*)
  59ec90c... build: Update the compiler warnings (*)

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