/usr/lib/x86_64-linux-gnu/pkgconfig/zzip-zlib-config.pc is in libzzip-dev 0.13.62-3ubuntu0.16.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | zlib_libs= -lz
zlib_cflags=
Name: zzip-zlib-config
Version:
Description: ZLib Config (for ZZipLib)
Libs: ${zlib_libs}
Cflags: ${zlib_cflags}
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