minizip: fix build

[tyler92]

[ 71%] Building C object CMakeFiles/minizip.dir/compat/unzip.c.o
/src/minizip-ng/compat/unzip.c:687:16: error: use of undeclared identifier 'Z_ERRNO'
  687 |         return UNZ_ERRNO;
      |                ^
/src/minizip-ng/compat/unzip.h:51:34: note: expanded from macro 'UNZ_ERRNO'
   51 | #define UNZ_ERRNO               (Z_ERRNO)
      |                                  ^
1 error generated.

https://oss-fuzz-build-logs.storage.googleapis.com/log-9d4da045-29d1-4b5f-b65b-1c3ac84b00a9.txt

[github-actions]

tyler92 is a new contributor to projects/minizip. The PR must be approved by known contributors before it can be merged. The past contributors are: DonggeLiu, nmoinvaz, inferno-chromium, devtty1er, Dor1s