ld-aarch64: check support before launching dt_relr tests
Not all aarch64 targets supports dt_relr as this requires some mechanisms on the OS side. Adjust support_dt_relr helper and use it in aarch64-elf.exp.
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Not all aarch64 targets supports dt_relr as this requires some mechanisms on the OS side. Adjust support_dt_relr helper and use it in aarch64-elf.exp.