git: vendor/ZLIB vendor/ZLIB: Add back LICENSE

[Aaron LI]

commit 1e71fa9ecb4c1e509f8470588d2b1e32570540fd
Author: Aaron LI <aly at aaronly.me>
Date:   Thu Mar 20 11:03:03 2025 +0800

    vendor/ZLIB: Add back LICENSE
    
    As we did for other vendor sources.  Don't know why it was
    deleted/missed before.

Summary of changes:
 contrib/zlib/LICENSE | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 contrib/zlib/LICENSE

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/1e71fa9ecb4c1e509f8470588d2b1e32570540fd


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