[HiGHSstatic] remove Zlib dependency

[odow]

Closes #8408

Let's just remove this for now. It was added in #8071, and it's only needed for cases where the user wants to read compressed MPS files.

[imciner2]

If you want to statically link ZLib, then I think you can try adding

-DZLIB_USE_STATIC_LIBS=ON

to the CMake invocation when you want the static library (and either setting it to OFF or leaving it out if you want the shared library). That should tell it to use a static library for ZLib instead of the shared library.

This will also require a newer CMake (3.24+), so you will want to add a new dependency as well to get a newer version than what we use by default (this will just pull in the most recent CMake version, which is currently 3.28):

HostBuildDependency(PackageSpec(; name="CMake_jll"))

[odow]

I'll need to remember to add HostBuildDependency(PackageSpec(; name="CMake_jll")), to `HiGHS_jll.jl the next time I rebuild it, but that's okay. I'll likely find this comment when I go searching if I forget.

[imciner2]

Looking at the artifacts for the Linux x86_64 build, the libz.so dependency has been removed, so I am guessing this is good to merge if all the builds pass. Any objections @odow?

[odow]

Let me just check the osx build

[odow]

Good by me:

(base) oscar@Oscars-MBP ~ % cd ~/Downloads/HiGHSstatic.v1.7.0.x86_64-apple-darwin.tar-2/bin
(base) oscar@Oscars-MBP bin % otool -L highs                                                 
highs:
	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 307.4.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1238.0.0)