update `bootstrap-prefix.sh` script

[trz42]

Might be needed to fix some issues we see when building the compat layer with the bot:

• Could not detect Ninja v1.8.2 or newer when emerging x11-base/xorg-proto

In any case good to keep the script updated.

[eessi-bot[bot]]

Instance eessi-bot-citc-aws is configured to build:

• arch x86_64/generic for repo eessi-2021.12
• arch x86_64/generic for repo eessi-2023.04
• arch x86_64/generic for repo eessi-2023.06-compat
• arch x86_64/generic for repo eessi-2023.06-software
• arch x86_64/intel/haswell for repo eessi-2021.12
• arch x86_64/intel/haswell for repo eessi-2023.04
• arch x86_64/intel/haswell for repo eessi-2023.06-compat
• arch x86_64/intel/haswell for repo eessi-2023.06-software
• arch x86_64/intel/skylake_avx512 for repo eessi-2021.12
• arch x86_64/intel/skylake_avx512 for repo eessi-2023.04
• arch x86_64/intel/skylake_avx512 for repo eessi-2023.06-compat
• arch x86_64/intel/skylake_avx512 for repo eessi-2023.06-software
• arch x86_64/amd/zen2 for repo eessi-2021.12
• arch x86_64/amd/zen2 for repo eessi-2023.04
• arch x86_64/amd/zen2 for repo eessi-2023.06-compat
• arch x86_64/amd/zen2 for repo eessi-2023.06-software
• arch x86_64/amd/zen3 for repo eessi-2021.12
• arch x86_64/amd/zen3 for repo eessi-2023.04
• arch x86_64/amd/zen3 for repo eessi-2023.06-compat
• arch x86_64/amd/zen3 for repo eessi-2023.06-software
• arch aarch64/generic for repo eessi-2021.12
• arch aarch64/generic for repo eessi-2023.04
• arch aarch64/generic for repo eessi-2023.06-compat
• arch aarch64/generic for repo eessi-2023.06-software
• arch aarch64/graviton2 for repo eessi-2021.12
• arch aarch64/graviton2 for repo eessi-2023.04
• arch aarch64/graviton2 for repo eessi-2023.06-compat
• arch aarch64/graviton2 for repo eessi-2023.06-software
• arch aarch64/graviton3 for repo eessi-2021.12
• arch aarch64/graviton3 for repo eessi-2023.04
• arch aarch64/graviton3 for repo eessi-2023.06-compat
• arch aarch64/graviton3 for repo eessi-2023.06-software