Switch <sys/unistd.h> to <unistd.h>

[fornwall]

This fixes compilation on Android.

Originally reported in termux/termux-packages#464.

[jirutka]

@ilanschnell This is a trivial fix that does not break anything and fixes build with musl libc and on Android. Why it’s still not merged? :(

[migueltorrescosta]

Any developments here? If the maintainers are no longer active, is there a clone that is actively maintained?

[github-actions]

Hi there, thank you for your contribution!

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed automatically if no further activity occurs.

If you would like this pull request to remain open please:

1. Rebase and verify the changes still work
2. Leave a comment with the current status

NOTE: If this pull request was closed prematurely, please leave a comment.

Thanks!

[github-actions]

Hi there, thank you for your contribution!

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed automatically if no further activity occurs.

If you would like this pull request to remain open please:

1. Rebase and verify the changes still work
2. Leave a comment with the current status

NOTE: If this pull request was closed prematurely, please leave a comment.

Thanks!