examples: Add missing Ecore_Eo.h for some defines.

If we are shuffling headers around testing if in-tree examples are
still working fine might be a sensible thing to do. Everybody agrees
on that?

src/examples/ecore/ecore_idler_example.c

@@ -2,6 +2,7 @@
 // gcc -o ecore_idler_example ecore_idler_example.c `pkg-config --libs --cflags ecore eo`
 
 #include <Ecore.h>
+#include <Ecore_Eo.h>
 #include <unistd.h>
 
 struct context   // helper struct to give some context to the callbacks

src/examples/ecore/ecore_poller_example.c

@@ -2,6 +2,7 @@
 // gcc -o ecore_poller_example ecore_poller_example.c `pkg-config --libs --cflags ecore eo`
 
 #include <Ecore.h>
+#include <Ecore_Eo.h>
 #include <unistd.h>
 
 static double _initial_time = 0;