[glibmm] (9 commits) Non-fast-forward update to branch export-more-symbols-2-64

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

The branch 'export-more-symbols-2-64' 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:

  94da036... tools/[gerror|enum].m4: Make template<> classes exportable
  62fd03e... glib/src: Apply `decl_prefix GLIBMM_API` to _WRAP_ENUM
  5567498... gio/src: Apply `decl_prefix GIOMM_API` to _WRAP_ENUM

Commits added to the branch:

  c575255... 2.64.1 (*)
  38cefa0... README: Fix a misspelling (*)
  9986383... Meson build: Install generate_extra_defs.h (*)
  54a5d39... Glib::build_filename(): Fix the template overload (*)
  e775940... 2.64.2 (*)
  ad25497... tools/[gerror|enum].m4: Make template<> classes exportable
  5875f4f... glib/src: Apply `decl_prefix GLIBMM_API` to _WRAP_ENUM
  0b3e3e8... gio/src: Apply `decl_prefix GIOMM_API` to _WRAP_ENUM
  ccf9aef... Bump version

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