[Intel-gfx] Some regression for piglit cases

[Shuang He]

All following cases results change to "SKIP"
     piglit/general/provoking-vertex
     piglit/general/sync_api
     piglit/general/draw-elements-base-vertex
     piglit/general/depth_clamp
     piglit/texturing/cubemap
     piglit/texturing/texdepth

Bisect result shows that these changes are due to following commit:
commit f19989237c85ead0074cd69ccfba0e2189d10eb1
Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Thu Oct 15 13:57:13 2009 -0700

     Use GLEW for vp / fp code instead of piglit "pgl" wrappers

But glew seems failed to detect support of  GL_EXT_provoking_vertex, 
GL_ARB_sync, GL_ARB_draw_elements_base_vertex, GL_ARB_depth_clamp, 
GL_ARB_texture_cube_map, GL_ARB_depth_texture

Thanks
     --Shuang