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To make the situation with testing a little better and enable building
core libraries totally independent of conscrypt, move the native
registration to a JNI_OnLoad scheme. Also, since we want to separate the
testing, make conscrypt build its own tests library.

(cherry picked from commit ba07db54)

Bug: 10092469
Change-Id: Ie0e9b73d05236a9bd02fbb66cb1a5da4ec34df45