Add GTK support to browse dialog filtering (#19)

Author: dkearns

Diff for: ftplugin/clojure.vim

@@ -64,8 +64,8 @@ if exists('loaded_matchit')
 	let b:undo_ftplugin .= ' | unlet! b:match_words b:match_skip'
 endif
 
-" Win32 can filter files in the browse dialog
-if has("gui_win32") && !exists("b:browsefilter")
+" Filter files in the browse dialog
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
 	let b:browsefilter = "Clojure Source Files (*.clj)\t*.clj\n" .
 	                   \ "ClojureScript Source Files (*.cljs)\t*.cljs\n" .
 	                   \ "Java Source Files (*.java)\t*.java\n" .