feat(mremap): `KEEP_OLD`

Depends on: syscall!94 (merged)

First the syscall PR would need to be merged and a new version of the crate will need to be published.

This MR adds support for the MremapFlags::KEEP_OLD flag in mremap.

changed the description

mentioned in merge request relibc!577 (merged)

added 1 commit

• d4797bbf - chore: update redox_syscall

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merged