[glibmm] (3 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:

  8278af9... tools/[gerror|enum].m4: Make template<> classes exportable
  f8987e9... glib/src: Apply `decl_prefix GLIBMM_API` to _WRAP_ENUM
  0706d64... gio/src: Apply `decl_prefix GIOMM_API` to _WRAP_ENUM

Commits added to 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