Call `find_dependency(CURL)` if the Curl client is enabled.

[teo-tsirpanis]

Description of changes:

This PR updates the exported config file to call find_dependency(CURL) if the Curl client had been enabled when building the SDK.

Check all that applies:

• [X] Did a review by yourself.
• [ ] Added proper tests to cover this PR. (If tests are not applicable, explain.)
• [ ] Checked if this PR is a breaking (APIs have been changed) change.
• [ ] Checked if this PR will not introduce cross-platform inconsistent behavior.
• [ ] Checked if this PR would require a ReadMe/Wiki update.

Check which platforms you have built SDK on to verify the correctness of this PR.

• [x] Linux
• [x] Windows
• [ ] Android
• [ ] MacOS
• [ ] IOS
• [ ] Other Platforms

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[jmklix]

Why exactly do you need this added to the cofig file? This looks like an ok change, but we want to make sure we understand what your use case is