crypto/openssl: fix importing new versions from pristine trees

[ngie]

Summary

Prior to this change, CC was not being passed through to Configure,
which was resulting in failures when Configure was running compiler
checks.

Pass through CC via WRK_ENV to Configure so the compiler is defined
properly as part of the initial build.

MFC after: 1 month
Fixes: d18058b7b850 ("crypto/openssl: apply polish to new vendor import process")

Test Plan

This was needed to run Configure when upgrading from 3.5.1 to 3.5.3.