Log Message:
Import hs-mmap4-0.4.1 as wip/hs-mmap4.

This library provides a wrapper to mmap(2) or MapViewOfFile, allowing
files or devices to be lazily loaded into memory as strict or lazy
ByteStrings, ForeignPtrs or plain Ptrs, using the virtual memory
subsystem to do on-demand loading. Modifications are also supported.