Remove CXX Standard String from `sc_api_version`

[AmeyaVS]

Would it be possible to remove the cxx_standard string concatenated in the definition of sc_api_version API?

Reference:

• https://github.com/accellera-official/systemc/blob/main/src/sysc/kernel/sc_ver.h#L105

This causes all dependent library, executable to be build with the same exact C++ standard flag.

This might cause issues when mixing third-party libraries along with SystemC library and trying to wrangle different library build systems to work well with SystemC becomes kind of a hassle.

Locally I have tried removing this CXX standard version string and eases the integration, when working with libraries with other build systems.