For that to happen the libgtk3 is embedded with a manifest that requests
common controls library 6.x, and GTK lazily calls InitCommonControlsEx()
to initialize those. Then this manifest is used to temporarily override
the process activation contest when loading comdlg32 (which contains the
code for the print dialog), ensuring that it too depends on common
controls 6.x, even if the application that uses GTK does not.
https://bugzilla.gnome.org/show_bug.cgi?id=733773
- add gtkmodulesprivate.h and move stuff there from gtkprivate.h
- add gtkprivate.c and move stuff there from gtkmain.c
- add gtkwin32.c and move stuff there from gtkmain.c
- don't redefine GTK_DATADIR and friends in gtkprivate.h
- have _gtk_get_datadir() and friends on all platforms
- remove the horrid hacks where gtkprivate.h can't be included,
or must be included later due to redefinition of the compile-time
directories
