meson: Fix unwinding error in libunwind over glibc - #5267
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glibc's pthread_cancel dlopens libgcc_s.so.1 and uses its unwinder, while libc++abi's personality routine resolves the Unwind* accessors from the global scope, where LLVM libunwind wins. This causes the two unwinders to interpret each other's unwind context incorrectly, and cancelling a thread segfaults. Pull libgcc_s into DT_NEEDED before libc++abi/libunwind so all Unwind* symbols resolve to the same unwinder.
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glibc's pthread_cancel dlopens libgcc_s.so.1 and uses its unwinder, while libc++abi's personality routine resolves the Unwind* accessors from the global scope, where LLVM libunwind wins. This causes the two unwinders to interpret each other's unwind context incorrectly, and cancelling a thread segfaults. Pull libgcc_s into DT_NEEDED before libc++abi/libunwind so all Unwind* symbols resolve to the same unwinder.