Include <Eet.h> where needed. cf:

https://github.com/openembedded/meta-oe/blob/master/meta-efl/recipes-efl/efl/efl/0002-evas_3d-Add-Eet.h-includes.patch

src/lib/evas/canvas/evas_canvas3d_eet.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <Eet.h>
 #include "evas_common_private.h"
 #include "evas_private.h"
 

src/modules/evas/model_loaders/eet/evas_model_load_eet.c

@@ -3,6 +3,7 @@
 #endif
 
 #include <Eo.h>
+#include <Eet.h>
 #include <stdio.h>
 #include "evas_common_private.h"
 #include "evas_private.h"

src/modules/evas/model_savers/eet/evas_model_save_eet.c

@@ -2,6 +2,7 @@
    #include "config.h"
 #endif
 
+#include <Eet.h>
 #include <stdio.h>
 #include "evas_common_private.h"
 #include "evas_private.h"