gentoo: remove bzip2 from gentoo.py
gentoo: remove bzip2 from gentoo.py

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Former-commit-id: 561cf21877a73e3c2494f6109443597470ba15e6 [formerly 176b009582bd5b702944569ccb5808c531241b64] [formerly cf09a6567053b67344f382e54af5c852e0fce981 [formerly d120922fd93b4a3e088f6ac999ed987366c8ce2e]]
Former-commit-id: 122f8dcbb1245bc18e84a02bc94e2a1177b43014 [formerly e85a470e3a98c6854a1f172c628dd6f16bff0d69]
Former-commit-id: bcb9386aa61f7a7e60afe57216246b7a429c8cb2
PolyJIT/benchbuild,PolyJIT/benchbuild,PolyJIT/benchbuild,PolyJIT/benchbuild