Add the macro for the supported specification version

[akukanov]

Summary

Implement the macro for the supported specification version, as described in uxlfoundation/oneAPI-spec#592:

• ONETBB_SPEC_VERSION macro defined to the decimal literal whose value equals to
  x * 100 + y, where x is the major version and y is the minor version
  of the latest specification of oneTBB fully supported by the implementation.