RTEMS Source Builder | rtems-gcc-15.2-newlib-head.cfg: Define host_c_std and host_cxx_std as gnu17 and gnu++17 (!257)

[Ayush Yadav (@acidicneko)]

Ayush Yadav created a merge request: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/merge_requests/257

Project:Branches: acidicneko/rtems-source-builder:rtems-gcc-15.2-std-patch to rtems/tools/rtems-source-builder:main
Author:   Ayush Yadav



## Summary

rtems-gcc-15.2-newlib-head.cfg: Define host_c_std and host_cxx_std as gnu17 and gnu++17

gcc 15.2 doesn't compile on newer GCC versions due to newer C and CPP standard being the default. 

This fixes it by defining the pre-C23, pre-C++20 compiler standard, i.e GNU17 and GNU++17

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