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uclibc-ng supports the RISC-V architecture since version 1.0.31, so let's allow selecting this C library when RISC-V is used. There was a previous attempt in commitbd9810e176, which was reverted ine7d631c0df, due to uClibc-ng not implementing the __riscv_flush_icache() which is needed by gcc. However this function has been implemented in upstream uClibc-ng as of 1.0.35, so we can now safely re-enable uClibc-ng on RISC-V. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>