Add USE_LIBRESSL build option (GONRG-900)

Adds ability to build GCP against original OpenSSL library

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [NO]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this introduce a breaking change?

• [NO]

What is the current behavior?

There is no way to to build GCP against original OpenSSL library on Windows

What is the new/expected behavior?

If OpenSSL is installed on Windows you can disable USE_LIBRESSL option in order to build GCP against original OpenSSL library

Have you added/updated Unit Tests and Integration Tests?

• [NO]

Changes:

• USE_LIBRESSL option was added to CMake script