wl_drm and eayland_egl buffer age fix for gl when age changes

so i was just about to add buffer age debugging evlogs to everywhere
doing buffer age and i found... drm gl and wayland gl engines DONT
HANDLE age change like gl_x11! they dont reset to a "full render" for
that frame. well well. this explains bugs i am seeing for sure. very
very bag! i thought this was handled properly. this does lend some
credence to my thoughts about somehow having a single universal buffer
swapping/update calculating and "applying" api inside efl somewhere...

anyway - this fixes this issue for these 2 engines which is a real
necessary fix to be correct.

@fix

src/modules/evas/engines/gl_drm/evas_engine.h

@@ -89,6 +89,7 @@ struct _Outbuf
 
    int fd, w, h, bpp;
    unsigned int rotation, depth, format;
+   int prev_age;
    Render_Engine_Swap_Mode swap_mode;
 
    struct gbm_surface *surface;

src/modules/evas/engines/gl_drm/evas_outbuf.c

@@ -600,6 +600,8 @@ evas_outbuf_buffer_state_get(Outbuf *ob)
         else if (age == 3) swap_mode = MODE_TRIPLE;
         else if (age == 4) swap_mode = MODE_QUADRUPLE;
         else swap_mode = MODE_FULL;
+        if ((int)age != ob->prev_age) swap_mode = MODE_FULL;
+        ob->prev_age = age;
 
         return swap_mode;
      }

src/modules/evas/engines/wayland_egl/evas_engine.h

@@ -65,6 +65,7 @@ struct _Outbuf
    Evas_Engine_Info_Wayland *info;
    Evas_Engine_GL_Context *gl_context;
 
+   int prev_age;
    Render_Engine_Swap_Mode swap_mode;
    int vsync;
    int frame_cnt;

src/modules/evas/engines/wayland_egl/evas_wl_main.c

@@ -380,6 +380,8 @@ eng_outbuf_swap_mode_get(Outbuf *ob)
         else if (age == 3) swap_mode = MODE_TRIPLE;
         else if (age == 4) swap_mode = MODE_QUADRUPLE;
         else swap_mode = MODE_FULL;
+        if ((int)age != ob->prev_age) swap_mode = MODE_FULL;
+        ob->prev_age = age;
 
         return swap_mode;
      }