Set DEP_Z_INCLUDE if zlib from vcpkg

[sagudev]

No description provided.

[Byron]

Could you elaborate?
Please also feel free to put the motivation into a comment so future readers find out about it more easily.

[sagudev]

Could you elaborate? Please also feel free to put the motivation into a comment so future readers find out about it more easily.

Well, DEP_Z_INCLUDE is already set when zlib is found via pkg-config:

libz-sys/build.rs

Lines 44 to 53 in 50dfd55

	Ok(zlib) => {
	if !zlib.include_paths.is_empty() {
	let paths = zlib
	.include_paths
	.iter()
	.map(|s| s.display().to_string())
	.collect::<Vec<_>>();
	println!("cargo:include={}", paths.join(","));
	}
	}

so I see no reason why we wouldn't do the same for vcpkg (I somehow expected it already). This is useful for other build script to be able to get include dir of zlib in more cases, instead of doing queries themself.

[Byron]

Thanks!

Could you put the motivation/explanation above into the commit message so I can merge?

Thanks again.

[Byron]

Thanks a lot for contributing, much appreciated.