[SPEC] Define arch/os portability flag for riscv64-linux-gnu #158
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Without -DSPEC_MANUAL_CONFIG (or another dummy arch/os flag specified), 500.perlbench_r will fail to build on riscv64-linux-gnu. -DSPEC_LP64 and -DSPEC_LINUX are also already defined via the generic handlers above. I'm not sure if we need to define more flags, but this enough to get things building.