__opencl_c_integer_dot_product_input_4x8bit / __opencl_c_integer_dot_product_input_4x8bit_packed feature macros are always enabled, even on unsupported devices

[ProjectPhysX]

isDotIntegerProductExtensionSupported() always returns true, which is incorrect. It leads to the __opencl_c_integer_dot_product_input_4x8bit / __opencl_c_integer_dot_product_input_4x8bit_packed feature macros always being present, even on unsupported devices.

This means: If any OpenCL application implements dp4a with checks for __opencl_c_integer_dot_product_input_4x8bit / __opencl_c_integer_dot_product_input_4x8bit_packed feature macros to see of dot()/dot_acc_sat() functions are available, the application will instantly be broken on all older unsupported Intel platforms - compiling will just fail because dot()/dot_acc_sat() functions will be exposed by false feature macros but are not actually supported by compiler.

This is especially important to fix on legacy driver too.

Please fix!