boringssl: Add build script for boringssl Add build scripts for compiling boringssl library. An emply place holder entropy implementation is added. Change-Id: I41ac3ccef74f1d3654833bbd4a159dce05094963 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45241 Commit-Queue: Yecheng Zhao <zyecheng@google.com> Reviewed-by: Ali Zhang <alizhang@google.com>
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