intel: Don't advertise unsupported extensions on pre-965 hardware
intel: Don't advertise unsupported extensions on pre-965 hardware

Move GL_ARB_texture_non_power_of_two and GL_ATI_separate_stencil
from the generic extension list to the 965-specific list.  Neither
extension is supported on i830-class hardware, and
GL_ATI_separate_stencil is not supported on i915-class hardare.
GL_ARB_texture_non_power_of_two is supported on i915-class hardare and
is already in the i915-specific list.

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