Ignore duplicates in |X509_STORE_add_*|

This change imports upstream's
https://github.com/openssl/openssl/commit/c0452248ea1a59a41023a4765ef7d9825e80a62b

Bug: 226230302
Test: treehugger

Change-Id: Ib50ff9eb8c48d9580aa2ffcae92d3990cc987e30
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/50905
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
7 files changed