[Bug libelf/23903] Uses linux specifc mremap

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23903

--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
Having an msync that doesn't write out changes to a file is bad, but you might
get away with it in most cases (the changes should be written to disk when
munmap is called).

You do need a mremap function, even if it always fails.

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