Use RETURN_THIS() and my_pop_n_elems

Rev: src/post_modules/GTK/source/gdkatom.pre:1.2
Rev: src/post_modules/GTK/source/gdkbitmap.pre:1.2
Rev: src/post_modules/GTK/source/gdkcolor.pre:1.2
Rev: src/post_modules/GTK/source/gdkdragcontext.pre:1.2
Rev: src/post_modules/GTK/source/gdkimage.pre:1.2
Rev: src/post_modules/GTK/source/gdkrectangle.pre:1.2
Rev: src/post_modules/GTK/source/gdkregion.pre:1.2
Rev: src/post_modules/GTK/source/gdkwindow.pre:1.3
Rev: src/post_modules/GTK/source/global.pre:1.2
Rev: src/post_modules/GTK/source/gtkaccelgroup.pre:1.2
Rev: src/post_modules/GTK/source/gtkadjustment.pre:1.2
Rev: src/post_modules/GTK/source/gtkbox.pre:1.2
Rev: src/post_modules/GTK/source/gtkbuttonbox.pre:1.2
Rev: src/post_modules/GTK/source/gtkclist.pre:1.2
Rev: src/post_modules/GTK/source/gtkcontainer.pre:1.2
Rev: src/post_modules/GTK/source/gtkctree.pre:1.2
Rev: src/post_modules/GTK/source/gtkcurve.pre:1.2
Rev: src/post_modules/GTK/source/gtkimage.pre:1.2
Rev: src/post_modules/GTK/source/gtklist.pre:1.2
Rev: src/post_modules/GTK/source/gtkmenushell.pre:1.2
Rev: src/post_modules/GTK/source/gtknotebook.pre:1.2
Rev: src/post_modules/GTK/source/gtkobject.pre:1.2
Rev: src/post_modules/GTK/source/gtkpixmap.pre:1.2
Rev: src/post_modules/GTK/source/gtkradiomenuitem.pre:1.2
Rev: src/post_modules/GTK/source/gtkselectiondata.pre:1.3
Rev: src/post_modules/GTK/source/gtksheet.pre:1.2
Rev: src/post_modules/GTK/source/gtksocket.pre:1.2
Rev: src/post_modules/GTK/source/gtktext.pre:1.2
Rev: src/post_modules/GTK/source/gtkwidget.pre:1.2