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After bumping zlib:

...
gcc -O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse -g -D_LARGEFILE64_SOURCE=1 -I. -D_FILE_OFFSET_BITS=64 -c -o minigzip64.o test/minigzip.c
ar rc libz.a adler32.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o 
gcc -O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse -g -D_LARGEFILE64_SOURCE=1 -o example example.o -L. libz.a
gcc -O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse -g -D_LARGEFILE64_SOURCE=1 -o minigzip minigzip.o -L. libz.a
cc -shared -O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse -g -D_LARGEFILE64_SOURCE=1 -o libz.so.1.2.12 adler32.lo crc32.lo deflate.lo infback.lo inffast.lo inflate.lo inftrees.lo trees.lo zutil.lo compress.lo uncompr.lo gzclose.lo gzlib.lo gzread.lo gzwrite.lo  -lc -Wl,--as-needed
gcc -O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse -g -D_LARGEFILE64_SOURCE=1 -o example64 example64.o -L. libz.a
gcc -O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse -g -D_LARGEFILE64_SOURCE=1 -o minigzip64 minigzip64.o -L. libz.a
/usr/lib/gcc/x86_64-foxkit-linux-musl/8.3.0/../../../../x86_64-foxkit-linux-musl/bin/ld: deflate.lo: relocation R_X86_64_PC32 against symbol `_length_code' can not be used when making a shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-foxkit-linux-musl/8.3.0/../../../../x86_64-foxkit-linux-musl/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status
make: *** [Makefile:282: libz.so.1.2.12] Error 1