SIS | sis does not compile with late model compilers (#5)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/issues/5



## Summary
GCC 15 defaults to C23. sis currently does not compile when the C version is C23. If you are on a host with a C compiler which defaults to C17 or older, there isn't an issue. In the RSB, we add _-std=gnu17_ to the build which specifies C17 with GNU extensions.

The long-term fix for this is to update the sis source to address all the warnings/errors produced when the selected language is C23. This issue is for the long-term solution. 

## Steps to reproduce

Compile with a late model compiler. This could be a newer distribution of gcc 15/16 built from source or an alternative compiler on Linux is the distribution supports something like RHEL Software Collections.

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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/issues/5
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