Force disable fetch zlib when compiling cpr

[Yohahaha]

The suggestions of disable fetching zlib from cpr master branch has a little bit difference compared with cpr 1.10.5 branch, which leads to situations that zlib still be fetched.

After checking original PR, 1.10.5 branch is right, let's fix it and saving compile time. cpr master branch: https://github.com/libcpr/cpr/blob/1ad1cd2daf138aefdcdb1c35d99608387d230ec1/CMakeLists.txt#L202-L209 cpr 1.10.5 branch: https://github.com/libcpr/cpr/blob/3b15fa82ea74739b574d705fea44959b58142eb8/CMakeLists.txt#L207-L215

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