git: : Add missing copyright and license header

[Aaron LI]

commit 935b8dd2002885193cdb12324b927e4c8ce462a6
Author: Aaron LI <a...@aaronly.me>
Date:   Mon Jan 18 21:51:19 2021 +0800

    <sys/sysmsg.h>: Add missing copyright and license header

Summary of changes:
 sys/sys/sysmsg.h | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/935b8dd2002885193cdb12324b927e4c8ce462a6


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