Use MAP_SHARED to allow sharing memory between processing

[shoumikhin]

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As of commit 8c89e8f with merge base 7565342 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  test_exported_decoder_xnnpack

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[mergennachin]

Looks like safe enough.

• It is using PROT_READ in ::mmap()
• It is using open(file_name, O_RDONLY);