Add --enable-strip to risc-v toolchain build #140

Job	Run time
Build Windows	2h 13m 8s
Build MacOS Arm64	9m 19s
Build Linux (self-hosted, linux, arm64)	1h 21m 9s
Build MacOS x64	1h 12m 58s
Build Linux (ubuntu-22.04)	41m 36s
	5h 38m 10s

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