[Issue 9155][build]Fixing the mac build if you use a different openssl #9165
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Fixes #9155
Motivation
When I attempted to build the c library on macosx with openssl 1.1.1i it failed with linkage errors. I tracked those errors down to the fact that the OPENSLL_ROOT_DIR was incorrect outside of mac vms used by the upstream.
Modifications
I set the default value first and then reset it only if running on mac.
Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
Does this pull request potentially affect one of the following parts:
No
Documentation
-None