New attempt for depth change using gstate_c.framebufChanged

New attempt to use gstate_c.framebufChanged inside TextureCache::NotifyFramebuffer() to detect those render-to-texture for depth setting .

It fixes all the issues i tested so far . 

1. Saint Seiya Omega
![screen00006](https://f.cloud.github.com/assets/3000282/827692/d9b3e610-f0a1-11e2-89d0-563fbd65d35c.jpg)

2. Gundam AGE Universe
![screen00009](https://f.cloud.github.com/assets/3000282/827693/dd388aca-f0a1-11e2-8016-0bf7d84906c9.jpg)

3. Untold.Legends.2.The.Warriors.Code
![screen00007](https://f.cloud.github.com/assets/3000282/827695/df88ef5e-f0a1-11e2-8c48-69faeecf26a0.jpg)

4. Ridge Race 2
![screen00008](https://f.cloud.github.com/assets/3000282/827696/e20a5772-f0a1-11e2-9ef5-7a576a857e90.jpg)