gtk2 rbgdkdragcontext.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkdraw.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkevent.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkgc.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkkeymap.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkpango.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkpixbuf.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkpixmap.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkproperty.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkscreen.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkselection.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkvisual.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkwindow.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgdkx11.c: drop GTK_CHECK_VERSION(2,2,0)
Merge pull request #183 from cosmo0920/drop-gtk2.2.0-macro-gdk-part

drop GTK_CHECK_VERSION(2,2,0) macro in gtk2/gdk*.c

Patch by cosmo. Thanks!!!
gtk2 rbgtk.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgtkcolormap.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgtkcursor.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgtkdisplay.c: drop GTK_CHECK_VERSION(2,2,0)
gtk2 rbgtkdisplaymanager.c: drop GTK_CHECK_VERSION(2,2,0)