boost: Use latest builder

[maflcko]

Required for the compiler bump in #12077

Full log: https://oss-fuzz-gcb-logs.storage.googleapis.com/log-49527212-a452-4fff-aaa5-293bf0924395.txt

[github-actions]

maflcko has previously contributed to projects/boost. The previous PR was #11714

[maflcko]

@tyler92 Maybe you can help here?

[tyler92]

Hi @maflcko

I'm not a boost maintainer, but I think you can use the same approach I used in #12109 (by the way, I'm waiting for a response there) to build boost:

./bootstrap.sh --with-toolset=clang

echo "using clang : ossfuzz : $CXX : <compileflags>\"$CXXFLAGS\" <linkflags>\"$CXXFLAGS\" <linkflags>\"${LIB_FUZZING_ENGINE}\" ;" >user-config.jam

./b2 --user-config=user-config.jam --toolset=clang-ossfuzz link=static --with-headers --with-graph --with-filesystem --with-program_options headers stage;

I tried this with your branch and at least infra/helper.py build_image / build_fuzzers / run_fuzzer works well.

[maflcko]

Thanks, pushed your fix.