Change the Prefix field of the Route Information Option to be variable-length. #132

Job	Run time
buildroot (qemu_x86_defconfig, glibc)	1m 24s
buildroot (qemu_x86_defconfig, uclibc)	1m 12s
buildroot (qemu_x86_defconfig, musl)	1m 30s
buildroot (qemu_x86_64_defconfig, glibc)	2m 6s
buildroot (qemu_x86_64_defconfig, uclibc)	1m 14s
buildroot (qemu_x86_64_defconfig, musl)	1m 57s
buildroot (raspberrypi4_defconfig, glibc)	1m 59s
buildroot (raspberrypi4_defconfig, uclibc)	1m 42s
buildroot (raspberrypi4_defconfig, musl)	1m 30s
buildroot (raspberrypi4_64_defconfig, glibc)	1m 22s
buildroot (raspberrypi4_64_defconfig, uclibc)	1m 21s
buildroot (raspberrypi4_64_defconfig, musl)	1m 29s
buildroot (qemu_ppc64le_pseries_defconfig, glibc)	1m 31s
buildroot (qemu_ppc64le_pseries_defconfig, uclibc)	1m 25s
buildroot (qemu_ppc64le_pseries_defconfig, musl)	1m 32s
buildroot (qemu_mips32r2_malta_defconfig, glibc)	1m 18s
buildroot (qemu_mips32r2_malta_defconfig, uclibc)	1m 11s
buildroot (qemu_mips32r2_malta_defconfig, musl)	1m 56s
buildroot (qemu_mips64_malta_defconfig, glibc)	1m 30s
buildroot (qemu_mips64_malta_defconfig, uclibc)	1m 16s
buildroot (qemu_mips64_malta_defconfig, musl)	1m 14s
buildroot (qemu_riscv32_virt_defconfig, glibc)	1m 22s
buildroot (qemu_riscv32_virt_defconfig, uclibc)	1m 23s
buildroot (qemu_riscv32_virt_defconfig, musl)	2m 1s
buildroot (qemu_riscv64_virt_defconfig, glibc)	2m 5s
buildroot (qemu_riscv64_virt_defconfig, uclibc)	1m 12s
buildroot (qemu_riscv64_virt_defconfig, musl)	1m 28s
	41m 10s

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