Update README files #616

Job	Run time
Buildroot (qemu_x86_defconfig, glibc)	1m 29s
Buildroot (qemu_x86_defconfig, uclibc)	2m 20s
Buildroot (qemu_x86_defconfig, musl)	1m 23s
Buildroot (qemu_x86_64_defconfig, glibc)	1m 28s
Buildroot (qemu_x86_64_defconfig, uclibc)	1m 26s
Buildroot (qemu_x86_64_defconfig, musl)	2m 10s
Buildroot (raspberrypi4_defconfig, glibc)	1m 28s
Buildroot (raspberrypi4_defconfig, uclibc)	1m 27s
Buildroot (raspberrypi4_defconfig, musl)	1m 24s
Buildroot (raspberrypi4_64_defconfig, glibc)	1m 29s
Buildroot (raspberrypi4_64_defconfig, uclibc)	1m 35s
Buildroot (raspberrypi4_64_defconfig, musl)	2m 8s
Buildroot (qemu_ppc64le_pseries_defconfig, glibc)	1m 24s
Buildroot (qemu_ppc64le_pseries_defconfig, uclibc)	1m 32s
Buildroot (qemu_ppc64le_pseries_defconfig, musl)	2m 10s
Buildroot (qemu_mips32r2_malta_defconfig, glibc)	1m 27s
Buildroot (qemu_mips32r2_malta_defconfig, uclibc)	1m 21s
Buildroot (qemu_mips32r2_malta_defconfig, musl)	1m 18s
Buildroot (qemu_mips64_malta_defconfig, glibc)	2m 2s
Buildroot (qemu_mips64_malta_defconfig, uclibc)	1m 24s
Buildroot (qemu_mips64_malta_defconfig, musl)	2m 3s
Buildroot (qemu_riscv32_virt_defconfig, glibc)	1m 25s
Buildroot (qemu_riscv32_virt_defconfig, uclibc)	1m 25s
Buildroot (qemu_riscv32_virt_defconfig, musl)	1m 25s
Buildroot (qemu_riscv64_virt_defconfig, glibc)	1m 26s
Buildroot (qemu_riscv64_virt_defconfig, uclibc)	2m 21s
Buildroot (qemu_riscv64_virt_defconfig, musl)	2m 7s
	44m 37s

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