compilersupport: fix compilation in C23 mode #309
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GCC15 added support for C23's `unreachable()`, causing a warning:
```
src/compilersupport_p.h:215:11: warning: ‘unreachable’ redefined
215 | # define unreachable() __builtin_unreachable()
| ^~~~~~~~~~~
stddef.h:468:9: note: this is the previous definition
468 | #define unreachable() (__builtin_unreachable ())
| ^~~~~~~~~~~
```
Signed-off-by: Thiago Macieira <[email protected]>
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GCC15 added support for C23's
unreachable(), causing a warning: