[libglnx] (8 commits) ...Merge branch 'wip/smcv/warnings' into 'master'

[Phaedrus Leeds <mwleeds src gnome org>]

Summary of changes:

  f8b7343... console: Mark an unused parameter as such (*)
  2d007fa... fdio, xattrs: Mark unused cancellables as such (*)
  d78121a... fdio: Make signedness of iterator consistent with limit (*)
  f65b05f... fdio: Match signedness of length parameter (*)
  4c51a54... tests: Make iterator signedness agree with limit (*)
  7b26e39... tests: Make signedness of timestamp agree (*)
  9f033ee... meson: Build with more warnings by default (*)
  c59eb27... Merge branch 'wip/smcv/warnings' into 'master'

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