gtk+: Correct function prototype

This is turned on by default in gcc-5 so far
we have been getting by this issue but time to fix it
has now come

Change-Id: I012248731de0be7a9b7e232073746360fe6c83dd
(From OE-Core rev: 8d8db821d7bcf30079f5a71c255481b12ec00e17)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/gtk+/gtk+/strict-prototypes.patch

@@ -0,0 +1,24 @@
+Fixes
+
+include/gtk-2.0/gtk/gtkitemfactory.h:47:1: warning: function declaration isn't a prototype [-Wstrict-prototypes]
+ typedef void (*GtkItemFactoryCallback)  ();
+
+gcc5 has -Wstrict-prototypes on by default for -Werror so this becomes a build failure for consumers
+of this header e.g. matchbox-panel-2
+
+Upstream-Status: Pending
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Index: gtk+-2.24.27/gtk/gtkitemfactory.h
+===================================================================
+--- gtk+-2.24.27.orig/gtk/gtkitemfactory.h
++++ gtk+-2.24.27/gtk/gtkitemfactory.h
+@@ -44,7 +44,7 @@ typedef void	(*GtkPrintFunc)		   (gpoint
+  * (Note that if we are included from a C++ program () will mean
+  * (void) so an explicit cast will be needed.)
+  */
+-typedef	void	(*GtkItemFactoryCallback)  ();
++typedef	void	(*GtkItemFactoryCallback)  (void);
+ typedef	void	(*GtkItemFactoryCallback1) (gpointer		 callback_data,
+ 					    guint		 callback_action,
+ 					    GtkWidget		*widget);

meta/recipes-gnome/gtk+/gtk+_2.24.27.bb

@@ -9,6 +9,7 @@ SRC_URI = "http://ftp.gnome.org/pub/gnome/sources/gtk+/2.24/gtk+-${PV}.tar.xz \
            file://hardcoded_libtool.patch \
            file://toggle-font.diff;striplevel=0 \
            file://doc-fixes.patch \
+           file://strict-prototypes.patch \
 	  "
 
 SRC_URI[md5sum] = "b1e890e15602c5bcb40d85b13fe046fd"