Speculatively fill in what couriersud forgot to commit. This is

probably horribly wrong, but it fixes the build and renders video OS X
with the OpenGL renderer.  Treat it as an interim fix to keep things
working (for some values of "working") until couriersud commits the
actual code.

src/osd/modules/osdwindow.h

@@ -0,0 +1,99 @@
+//============================================================
+//
+//  osdwindow.h - SDL window handling
+//
+//  Copyright (c) 1996-2015, Nicola Salmoria and the MAME Team.
+//  Visit http://mamedev.org for licensing and usage restrictions.
+//
+//============================================================
+
+// There is no way this code is correct or sensible - it just gets it to build on OSX
+// Wait for official fix from couriersud
+
+#ifndef __OSDWINDOW__
+#define __OSDWINDOW__
+
+#include "render.h"
+
+
+class osd_window_config
+{
+public:
+	int	width;
+	int	height;
+	int	depth;
+	int	refresh;
+};
+
+
+class osd_window
+{
+public:
+	virtual void get_size(int &w, int &h) = 0;
+
+	virtual running_machine &machine() const = 0;
+
+	virtual render_target *target() = 0;
+#if (SDLMAME_SDL2)
+	virtual SDL_Window *sdl_window() = 0;
+#else
+	virtual SDL_Surface *sdl_surface() = 0;
+#endif
+
+	virtual void blit_surface_size(int &blitwidth, int &blitheight) = 0;
+	virtual int prescale() const = 0;
+	virtual float aspect() const { return 0; }
+
+	render_primitive_list	*m_primlist;
+
+protected:
+	osd_window_config		m_win_config;
+	int						m_prescale;
+};
+
+
+class osd_renderer
+{
+public:
+	enum
+	{
+		FLAG_NEEDS_DOUBLEBUF	= 1,
+		FLAG_NEEDS_ASYNCBLIT	= 2,
+		FLAG_NEEDS_OPENGL		= 4,
+		FLAG_HAS_VECTOR_SCREEN	= 8
+	};
+
+	void notify_changed();
+
+	virtual int create() = 0;
+	virtual int draw(const int update) = 0;
+	virtual int xy_to_render_target(const int x, const int y, int *xt, int *yt) = 0;
+	virtual void destroy() = 0;
+	virtual render_primitive_list *get_primitives() = 0;
+
+	bool has_flags(int f) const { return (m_flags & f) == f; }
+	void set_flags(int f) { m_flags |= f; }
+	void clear_flags(int f) { m_flags &= ~f; }
+
+protected:
+	enum
+	{
+		FI_CHANGED				= 16
+	};
+
+	osd_renderer(osd_window *w, int extra_flags) :
+		m_window(*w),
+		m_flags(extra_flags)
+	{
+	}
+
+	osd_window &window() const { return m_window; }
+
+private:
+	osd_window	&m_window;
+	int			m_flags;
+};
+
+inline void osd_renderer::notify_changed() { set_flags(FI_CHANGED); }
+
+#endif