[vala] Created tag 0.40.8

[Rico Tzschichholz <ricotz src gnome org>]

The signed tag '0.40.8' was created.

Tagger: Rico Tzschichholz <ricotz ubuntu com>
Date: 1531741229 +0200

    0.40.8

Changes since the last tag '0.40.7':

Alistair Thomas (3):
      doc: Fix links in the Manual
      libvaladoc: Change link to Valadoc wiki page for HTML doclet
      valadoc: Use HTML5 doctype in HTML doclet

Rico Tzschichholz (18):
      gtk+-4.0: Update to 3.94.0+14620423
      codegen: Let methods return -1 on error by default if possible
      gobject-2.0: Add lower_case_csuffix attributes to Type* symbols
      codegen: Allow TypeModule subclasses as parameter-type in module-init-method
      girparser: Allow changing the type of constants using metadata
      girwriter: Add boolean GIR visible attribute to allow skipping symbols
      gobject-2.0: Add missing symbols
      gdk-3.0,gtk+-3.0: Update to 3.23.0+df045423
      gtk+-4.0: Update to 3.94.0+7030e08f
      vala: Report error for error-domains without any code
      parser: Accept "empty" enums/error-domains
      codewriter: Output bodies of code-blocks if in VAPIGEN mode
      gio-2.0: Add custom IOError.from_errno() to make it work as expected
      tests: Add invalid "empty" enum/errordomain tests to increase coverage
      gtk+-4.0: Update to 3.94.0+bf5f27c6
      gstreamer-rtsp-server-1.0: Update from 1.14+ git master
      manual: Update from wiki.gnome.org
      Release 0.40.8