Patch gnumeric to integrate into Mac OS X menu

[macports@…]

Some GTK2 applications have begun integrating into the Mac OS X menu bar when built against the Quartz back-end. Inkscape is an application that does this. This requires a slight source code change to the application. The folks at Imendio have written a library that helps a developer perform this integration. See http://developer.imendio.com/projects/gtk-macosx/integration.

I have attached a patch against gnumeric to the GNOME bug at http://bugzilla.gnome.org/show_bug.cgi?id=477381. This patch could be applied by gnumeric's Portfile until a solution is accepted upstream. Either the ige-mac-integration library could be packaged as a port or ige-mac-menu.c and ige-mac-menu.h could be patched into gnumeric's source tree.