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feat(std): emulate flock for solaris via fcntl Upstream Solaris flock emulation to libstd from cargo. This is borrowed from3b379fcc54/src/cargo/util/flock.rs (L502-L536)which was implemented by an Oracle employee. The code has been in cargo since 2022-12. Python's `fcntl.flock` emulates like this as well:c919d02ede/Modules/fcntlmodule.c (L337-L400)We did the same thing in0d0f4eac8b/compiler/rustc_data_structures/src/flock/unix.rs (L13-L39)However, should we just always falls back to fcntl for all Unix, instead of "unsupported"? try-job: `*-solaris`