fix ANDROID_BUILD_OPENSSL cmake option

[sbiscigl]

Issue #, if available:

issues/3014

Description of changes:

We have a cmake arg ANDROID_BUILD_OPENSSL that builds openssl with the NDK if specified by a user. That was broken during our aws-c-cal migration as we treated openssl as "completely removed". this adds back logic to find and link the built openssl if specifed.

Check all that applies:

• 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.

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