Fix libdtrace build with zsh as /bin/sh

[arichardson]

Summary

When zsh runs in POSIX sh mode it does not support the -e flag to echo.
Use printf instead of echo to avoid the "-e" characters being printed.

Obtained from: CheriBSD

[markj]

cddl/contrib/opensolaris/lib/libdtrace/common/mkerrno.sh

37 ↗

(On Diff #75679)

We can actually just drop the pragma ident. That's an old Solaris thing. Upstream (illumos) removes them whenever they modify files. The line following the copyright can be deleted as well. Ditto for the other files below.

[arichardson]

drop pragma ident