Fix Protobuf-C++.podspec build error problem

[takeh1k0]

As mentioned in this issue, there is a problem with the podspec of Protobuf-C++ and an error occurs when trying to build with Xcode project modified by pod install.

This pull request resolves the build error by:

• Add utf8_range source files to source_files.
• Add files to exclude_files to exclude unnecessary files that cause build errors.
• Add a directory to HEADER_SEARCH_PATHS so that utf8_range headers can be searched.
• Added Abseil as a dependent library. The reason I specify version 1.20240116.1 is to include PrivacyInfo.xcprivacy in the Abseil framework project to be generated.

[e-n-0]

Hello!
Did you managed to successfully build Protobuf-C++ with your fix?
I applied your fix, but I'm actually struggling to build it via XCode, I'm having this issue.

[takeh1k0]

Hello! Did you managed to successfully build Protobuf-C++ with your fix? I applied your fix, but I'm actually struggling to build it via XCode, I'm having this issue.

@e-n-0 Hi, my project is built with fixed Protobuf-C++ podspec.

I read your issue and tried to reproduce the problem. When I included abseil-umbrella.h , the same problem occured. However, I do not use abseil-umbrella.h in my project. Sorry I can't help you.

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