mz_config.h is missed from installation - broken build for all consumers

``` /usr/local/include/minizip-ng/mz.h:164:10: fatal error: 'mz_config.h' file not found 164 | #include "mz_config.h" | ^~~~~~~~~~~~~ 1 error generated. ``` ``` /usr/local/include/minizip-ng/mz_os.h:48:10: fatal error: 'mz_config.h' file not found 48 | #include "mz_config.h" | ^~~~~~~~~~~~~ 1 error generated. ``` `#include "mz_config.h"` added in this commit: https://github.com/zlib-ng/minizip-ng/commit/2f074dc2b677154fd3fa181f6452ade41c8d36e8