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CI: replace MIPS cross tests with PPC32 (#503) #930

Job	Run time
test-msrv	3m 16s
minimal-versions / minimal-versions	3m 6s
set-msrv / set-msrv	5s
build (1.59, thumbv7em-none-eabi)	3m 9s
windows (1.59.0, x86_64-pc-windows-gnu)	7m 23s
build (1.59, wasm32-unknown-unknown)	3m 13s
linux (i686-unknown-linux-gnu, 1.59.0, sudo apt update && sudo apt install gcc-multilib)	6m 37s
windows (stable, x86_64-pc-windows-gnu)	1m 22s
macos (1.59.0)	5m 9s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	3m 11s
build (stable, thumbv7em-none-eabi)	29s
macos (stable)	1m 14s
linux (x86_64-unknown-linux-gnu, 1.59.0)	7m 20s
build (stable, wasm32-unknown-unknown)	3m 15s
linux (x86_64-unknown-linux-gnu, stable)	2m 9s
cross (1.59.0, aarch64-unknown-linux-gnu, default)	3m 30s
cross (1.59.0, powerpc-unknown-linux-gnu, default)	3m 38s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 2s
cross (stable, powerpc-unknown-linux-gnu, default)	50s
cross (stable, aarch64-unknown-linux-gnu, asm)	1m 5s
	1h 1m 3s

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