unzip: sync with NetBSD upstream to add passphrase support

• Add support for password protected zip archives. We use memset_s() rather than explicit_bzero() for more portable (See PR).
• Use success/failure macro in exit()
• Mention ZIPX format in unzip(1)

Submitted by: Mingye Wang and Alex Kozlov (ak@)
PR: 244181
Reviewed by: mizhka
Obtained from: NetBSD
Differential Revision: https://reviews.freebsd.org/D28892

(cherry picked from commit a4724ff48108840416c83f10e15d666ac8d78937)