dispatch_sanity test: allow newer functions to be set to NOP
dispatch_sanity test: allow newer functions to be set to NOP

If a GL function was introduced in a later GL version than the
context we are testing, then it is okay if it is set to the
_mesa_generic_nop function.

Signed-off-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Reviewed-by: Paul Berry <de21b9f22e6dd0bdf7890875d6e07ef4967c44ce@gmail.com>

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