[glibmm/glibmm-2-62] (14 commits) ...Merge branch 'use-dllexport-2-62' into 'glibmm-2-62'

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

Summary of changes:

  6999091... meson: Use /utf-8 for Visual Studio builds (*)
  fb3601f... glib/glibmm/*.h: Mark classes and methods with GLIBMM_API (*)
  7eb8793... tools/m4: Allow one to decorate the generated wrap() protot (*)
  8725cbb... tools: Allow generating Glib:Error class with decorations (*)
  65e7543... glib/src: Decorate classes and methods with GLIBMM_API (*)
  04ae132... build: Do not use gendef.exe for glibmm (*)
  6c99b4f... gio/src/*.hg: Mark classes and functions with GIOMM_API (*)
  419ca38... gio/giomm/*.h: Mark classes and functions with GIOMM_API (*)
  990ce4a... Visual Studio builds: build giomm without gendef (*)
  85755d7... glibmm: Update glibmmconfig.h.[in|meson] for MSVC (*)
  7c591f9... Drop gendef (*)
  9da42cd... meson: Do not allow static MSVC-style builds (*)
  5201fbd... m4: Apply function decoration more thoroughly (*)
  43df172... Merge branch 'use-dllexport-2-62' into 'glibmm-2-62'

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