main/get_hash_params: Add GL_SAMPLE_SHADING_ARB
main/get_hash_params: Add GL_SAMPLE_SHADING_ARB

GL_SAMPLE_SHADING is specified as a valid pname for glGet in the
GL_ARB_sample_shading extension.  It seems as if we forgot to add it to the
table of pnames.

Signed-off-by: Jason Ekstrand <b186559eaedf698788888c8a2559b4efb4db10d6@intel.com>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Cc: 59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org

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