external/boringssl: Sync to 2c45fa0b90f61b27973fa81893e014fc8c8e8999.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/faa539f877432814d0f2de19846eb99f2ea1e207..2c45fa0b90f61b27973fa81893e014fc8c8e8999

Test: BoringSSL CTS Presubmits
Change-Id: Ie6dc40e0c979168ec73fa1165cbc6e6b83793439
diff --git a/src/include/openssl/cpu.h b/src/include/openssl/cpu.h
index 457a476..1a4294a 100644
--- a/src/include/openssl/cpu.h
+++ b/src/include/openssl/cpu.h
@@ -171,6 +171,8 @@
  * the Vector.AES category of instructions. */
 int CRYPTO_is_PPC64LE_vcrypto_capable(void);
 
+extern unsigned long OPENSSL_ppc64le_hwcap2;
+
 #endif  /* OPENSSL_PPC64LE */