[gtk+] Framework Carbon required for building against MacOSX10.12.sdk.

[John Ralls <jralls src gnome org>]

commit 832f5b892c33c62cff4120728bd68d2f70263764
Author: John Ralls <jralls ceridwen us>
Date:   Sat Nov 5 14:58:34 2016 -0700

    Framework Carbon required for building against MacOSX10.12.sdk.
    
    Should be harmless elsewhere.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9a83702..09c53d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -404,7 +404,7 @@ if test "x$enable_quartz_backend" = xyes; then
   backend_immodules="$backend_immodules,quartz"
   GDK_WINDOWING="$GDK_WINDOWING
 #define GDK_WINDOWING_QUARTZ"
-  GDK_EXTRA_LIBS="$GDK_EXTRA_LIBS -framework Cocoa"
+  GDK_EXTRA_LIBS="$GDK_EXTRA_LIBS -framework Cocoa -framework Carbon"
   DISABLE_ON_QUARTZ='%'
   AM_CONDITIONAL(USE_QUARTZ, true)
   if test "x$quartz_relocation" = xyes; then