Use the correct type for GLintptr
Use the correct type for GLintptr

On 32bit, intptr_t has a different type than khronos_intptr_t.

https://bugzilla.gnome.org/show_bug.cgi?id=691296
(cherry picked from commit a77222385812a696a999a871cde439f50b648f69)

Distrotech/cogl,Distrotech/cogl,Distrotech/cogl,Distrotech/cogl