gtk2 rbgdkcursor.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgdkwindow.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgdkdraw.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgdkscreen.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgdkdisplay.c: drop GTK_CHECK_VERSION(2,4,0)
Merge pull request #185 from cosmo0920/drop-gtk2.4.0-macro-gdk-part

drop GTK_CHECK_VERSION(2,4,0) macro in gtk2/rbgdk*.c

Patch by cosmo. Thanks!!!
gtk2: indent
gtk2: indent
gtk2: remove a trailing space
gtk2: fix unbaranced #endif
gtk2 rbgtkmenu.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkbutton.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkradioaction.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkdrag.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkscale.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkstock.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkfontbutton.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkentry.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkconst.c: drop GTK_CHECK_VERSION(2,4,0)
gtk2 rbgtkicontheme.c: drop GTK_CHECK_VERSION(2,4,0)