cogl: Move material_copy() out of the deprecated section
cogl: Move material_copy() out of the deprecated section

We strongly suggest people should be using cogl_material_copy(), but it
was hidden behind the deprecation guards.

Distrotech/cogl,djdeath/cogl-android,djdeath/cogl,Distrotech/cogl,collects/cogl,Distrotech/cogl,djdeath/cogl-android,djdeath/cogl,djdeath/cogl,gcampax/cogl,collects/cogl,spatulasnout/cogl,gcampax/cogl,Distrotech/cogl,spatulasnout/cogl,gcampax/cogl,gcampax/cogl,djdeath/cogl-android