Use strtoimax.

Use existing strtoimax instead of reinventing it

Merge ^/head r340126 through r340212.

capsicum: use a new capsicum helpers in tools

Use caph_{rights,ioctls,fcntls}_limit to simplify the code.

Convert `cap_enter() < 0 && errno != ENOSYS` to `caph_enter() < 0`.

No functional change intended.

Merge ^/head r318658 through r318963.

Remove the MAX_CHECK macro, it was initially used to test if a file was a
text file or not.

The check is not done by diff3 but by diff (the argument -a is directly passed
to diff(1))

Import working progress BSD diff3

import bsd diff3 from OpenBSD.
Differences with OpenBSD:
- lots of warning fixed
- no shell wrapper with diff3 actually living in libexec
- capsicumized

Keep it di

Import working progress BSD diff3

import bsd diff3 from OpenBSD.
Differences with OpenBSD:
- lots of warning fixed
- no shell wrapper with diff3 actually living in libexec
- capsicumized

Keep it disconnected as it is not yet good enough to replace GNU diff

The motivation to import it now it to allow other people to jump in and also to
have an open development on it

Obtained from: OpenBSD

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