[glibmm] (7 commits) Non-fast-forward update to branch glibmm-master-use-dllexport

[Chun-wei Fan <fanchunwei src gnome org>]

The branch 'glibmm-master-use-dllexport' 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:

  097564e... meson: Use /utf-8 for Visual Studio builds
  52ee0d1... glib/glibmm/*.h: Mark classes and methods with GLIBMM_API
  3850355... tools/m4: Allow one to decorate the generated wrap() protot
  24792d6... tools: Allow generating Glib:Error class with decorations
  6352d84... glib/src: Decorate classes and methods with GLIBMM_API
  20f3b5e... build: Do not use gendef.exe for glibmm

Commits added to the branch:

  deef6e7... Activate the glibmm_ustring_compose test (*)
  4c2b07e... meson: Use /utf-8 for Visual Studio builds
  7fb2c6d... glib/glibmm/*.h: Mark classes and methods with GLIBMM_API
  f12e03b... tools/m4: Allow one to decorate the generated wrap() protot
  02758b1... tools: Allow generating Glib:Error class with decorations
  9ccc557... glib/src: Decorate classes and methods with GLIBMM_API
  c3a4b29... build: Do not use gendef.exe for glibmm

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