external/boringssl: Sync to f8de2af7e319f83ba88579fbf127ba5fafc26c71.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/73ffb74b9e36a93a3e593010a367a610105da9a1..f8de2af7e319f83ba88579fbf127ba5fafc26c71

Change-Id: Iab4fb4fde30c1f26ad2b98160abca366bdea1da4
Test: BoringSSL CTS Presubmits.
diff --git a/src/ssl/ssl_key_share.cc b/src/ssl/ssl_key_share.cc
index 3ceb180..52ff85d 100644
--- a/src/ssl/ssl_key_share.cc
+++ b/src/ssl/ssl_key_share.cc
@@ -168,7 +168,7 @@
   uint8_t private_key_[32];
 };
 
-const struct {
+CONSTEXPR_ARRAY struct {
   int nid;
   uint16_t group_id;
   const char name[8];