ci: add -std=c99 to vtest-all.v to fix GCC 15 / C23 bool conflict#26452
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GCC 15 defaults to C23, where `bool`, `true`, and `false` are keywords. This conflicts with V's `typedef u8 bool` in cheaders.v. Adding `-std=c99` to the cc command ensures the generated v.c compiles without warnings on systems with GCC 15+. ref vlang#25805
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GCC 15 defaults to C23, where
bool,true, andfalseare keywords. This conflicts with V'stypedef u8 boolin cheaders.v.Adding
-std=c99to the cc command ensures the generated v.c compiles without warnings on systems with GCC 15+.ref #25805