[gimp] app: replace Carbon/Carbon.h by CoreGraphics/CoreGraphics.h.

[Jehan <jehanp src gnome org>]

commit 1b9729d46d8ed876f5add26d143c10b5da33bc14
Author: Jehan <jehan girinstud io>
Date:   Tue Jun 26 15:50:40 2018 +0200

    app: replace Carbon/Carbon.h by CoreGraphics/CoreGraphics.h.
    
    As asked by Samm and solid_black on IRC.
    Apparently tested and the change is fine, while getting rid of
    deprecated API. I cannot test myself.

 app/widgets/gimpwidgets-utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app/widgets/gimpwidgets-utils.c b/app/widgets/gimpwidgets-utils.c
index aeed4851aa..75f1619c6f 100644
--- a/app/widgets/gimpwidgets-utils.c
+++ b/app/widgets/gimpwidgets-utils.c
@@ -34,7 +34,7 @@
 #endif
 
 #ifdef PLATFORM_OSX
-#include <Carbon/Carbon.h>
+#include <CoreGraphics/CoreGraphics.h>
 #endif
 
 #include "libgimpbase/gimpbase.h"