Fix incorrectly installed shared library version

[Shizmob]

This fixes a mismatch between the SONAME in the C++ and C# libraries and the
actually installed shared library name: in the former case it uses the
language-specific major version, and in the latter case it uses the core major
major version. Switch to using the language-specific major version in the
installed shared library name as well to fix this mismatch.

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[ctiller]

Jenkins: this is ok to test

[Shizmob]

CLA signed.

[googlebot]

CLAs look good, thanks!

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[grpc-kokoro]

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[grpc-kokoro]

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[Shizmob]

🤔

[grpc-testing]

No significant performance differences

[grpc-kokoro]

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[grpc-testing]

Thanks for your pull request. The automated tests will run as soon as one of the admins verifies this change is ok for us to run on our infrastructure.

[grpc-kokoro]

[trickle] No significant performance differences

[jtattermusch]

Closing as duplicate of #16832.

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