Build

Enable Linux/uClibc-ng toolchain build in CI #494

Job	Run time
test-sim (ubuntu-22.04, newlib, rv64gc-lp64d, spike)	2h 24m 45s
build-multilib	0s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, gcc)	57m 28s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, llvm)	2h 30m 27s
build (ubuntu-20.04, newlib, rv64gc-lp64d, gcc)	56m 31s
build (ubuntu-20.04, newlib, rv64gc-lp64d, llvm)	2h 29m 38s
build (ubuntu-20.04, linux, rv32gc-ilp32d, gcc)	1h 4m 22s
build (ubuntu-20.04, linux, rv32gc-ilp32d, llvm)	2h 44m 46s
build (ubuntu-20.04, linux, rv64gc-lp64d, gcc)	1h 4m 3s
build (ubuntu-20.04, linux, rv64gc-lp64d, llvm)	2h 44m 28s
build (ubuntu-20.04, musl, rv64gc-lp64d, gcc)	59m 15s
build (ubuntu-20.04, uclibc, rv32gc-ilp32d, gcc)	52m 3s
build (ubuntu-20.04, uclibc, rv64gc-lp64d, gcc)	49m 53s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, gcc)	2h 9m 5s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, llvm)	2h 11m 6s
build (ubuntu-22.04, newlib, rv64gc-lp64d, gcc)	2h 11m 15s
build (ubuntu-22.04, newlib, rv64gc-lp64d, llvm)	2h 11m 1s
build (ubuntu-22.04, linux, rv32gc-ilp32d, gcc)	3h 3m 25s
build (ubuntu-22.04, linux, rv32gc-ilp32d, llvm)	2h 18m 19s
build (ubuntu-22.04, linux, rv64gc-lp64d, gcc)	3h 5m 0s
build (ubuntu-22.04, linux, rv64gc-lp64d, llvm)	2h 21m 54s
build (ubuntu-22.04, musl, rv64gc-lp64d, gcc)	52m 59s
build (ubuntu-22.04, uclibc, rv32gc-ilp32d, gcc)	44m 34s
build (ubuntu-22.04, uclibc, rv64gc-lp64d, gcc)	42m 56s
	1d 17h 29m 13s

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