Don't test the static library in `make testinstall' on Darwin.
Don't test the static library in `make testinstall' on Darwin.

Change-Id: I7ee61f1a9f16d290a9f383530350fa3a181e318c
Reviewed-on: https://code-review.googlesource.com/2400
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

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