Add initial color management framework code

ICC profiles can now be specified in weston.ini for each output, or a CMS
implementation can optionally loaded from a pluggable module.
diff --git a/src/compositor.h b/src/compositor.h
index 606497b..97c91c0 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -200,6 +200,7 @@
 	void (*set_backlight)(struct weston_output *output, uint32_t value);
 	void (*set_dpms)(struct weston_output *output, enum dpms_enum level);
 
+	int connection_internal;
 	uint16_t gamma_size;
 	void (*set_gamma)(struct weston_output *output,
 			  uint16_t size,