[gtk+] Fix DnD Introspection on Quartz Backend.

[John Ralls <jralls src gnome org>]

commit 205db2013c67c2e42a9ce6768e4947f4e115c4cc
Author: John Ralls <jralls ceridwen us>
Date:   Fri May 29 13:04:07 2015 -0700

    Fix DnD Introspection on Quartz Backend.
    
    Don't exclude the -quartz.c files from introspection_files.

 gtk/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 7fd739b..72ee47f 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1340,7 +1340,7 @@ distclean-local:
 if HAVE_INTROSPECTION
 introspection_files = \
     $(filter-out %private.h gtktextdisplay.h gtktextlayout.h gtkx.h, $(gtkinclude_HEADERS) 
$(a11yinclude_HEADERS) $(deprecatedinclude_HEADERS)) \
-    $(filter-out %win32.c %quartz.c, $(gtk_base_c_sources)) \
+    $(filter-out %win32.c, $(gtk_base_c_sources)) \
     gtkprintoperation-unix.c \
     gtktypebuiltins.h \
     gtktypebuiltins.c