RISC-V RVV cross-compilation build

Update README after C++14 requirement #2476

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Run time

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Job	Run time
RISC-V RVV256	7m 7s
RISC-V RVV512	43m 44s
RISC-V RVV512	5m 40s
RISC-V RVV256	5m 5s
RISC-V RVV512	7m 45s
RISC-V RVV128	7m 1s
RISC-V RVV256	5m 12s
RISC-V RVV128	4m 41s
RISC-V RVV128	4m 39s
	1h 30m 54s