Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Fix copy-pasted copyright

- Add Dell instead of "SRI International"
- Use standard BSD 2-clause copyright
- Remove DARPA sponsorship advertisement

libnetbsd: add compat header for glob.h

This is to diff reduce unnecessary additions to
contrib/netbsd-tests/lib/libc/gen/t_glob.c