git: libz: Clean up Makefile a bit

[Aaron LI]

commit dd6477120480863568e96d0ab6bc91092f3a5ca9
Author: Aaron LI <aly at aaronly.me>
Date:   Wed Mar 19 12:47:23 2025 +0800

    libz: Clean up Makefile a bit
    
    No functional changes.

Summary of changes:
 lib/libz/Makefile | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/dd6477120480863568e96d0ab6bc91092f3a5ca9


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