git: libz: Raise WARNS to 3

[Aaron LI]

commit 2ba61c6d6e80aa49bd00ee50e096d77b2782f069
Author: Aaron LI <aly at aaronly.me>
Date:   Thu Mar 20 12:59:34 2025 +0800

    libz: Raise WARNS to 3
    
    Actually, there would be only -Wcast-qual warnings if raise WARNS to 6.

Summary of changes:
 lib/libz/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/2ba61c6d6e80aa49bd00ee50e096d77b2782f069


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