sparc toolchain: add multilib #406

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	2m 2s
call-ci / build (armv7a9-zynq7000-qemu)	2m 10s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 22s
call-ci / build (armv7a9-zynq7000-zturn)	1m 31s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 45s
call-ci / build (armv7m7-imxrt105x-evk)	2m 16s
call-ci / build (armv7m7-imxrt106x-evk)	1m 45s
call-ci / build (armv7m7-imxrt117x-evk)	2m 8s
call-ci / build (host-generic-pc)	1m 19s
call-ci / build (ia32-generic-pc)	1m 26s
call-ci / build (ia32-generic-qemu)	1m 24s
call-ci / build (riscv64-generic-qemu)	1m 30s
call-ci / build (riscv64-generic-spike)	1m 2s
call-ci / test EMU (armv7a9-zynq7000-qemu)	6m 47s
call-ci / test EMU (host-generic-pc)	1m 3s
call-ci / test HW (armv7a7-imx6ull-evk)	3m 56s
call-ci / test EMU (ia32-generic-qemu)	4m 37s
call-ci / test HW (armv7m7-imxrt106x-evk)	1m 44s
call-ci / test HW (armv7m7-imxrt117x-evk)	2m 33s
call-ci / test HW (armv7a9-zynq7000-zedboard)	4m 42s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	9m 21s
call-ci / tests-summary	55s
call-ci / notify ci team using e-mail	0s
call-ci / send-notification	0s
	57m 18s

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