[gtk+] Drop no-longer-used gtkrc files

[Matthias Clasen <matthiasc src gnome org>]

commit 00d02491d8fda490e5578c44cf83e934c331ea35
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri May 23 22:00:51 2014 -0400

    Drop no-longer-used gtkrc files
    
    These were replaced by css files long ago.

 gtk/gtkrc.default     |    3 -
 gtk/gtkrc.key.default |    3 -
 gtk/gtkrc.key.emacs   |  111 -----------------------------------
 gtk/gtkrc.key.mac     |  155 -------------------------------------------------
 4 files changed, 0 insertions(+), 272 deletions(-)