Fix OpenSSL Builds

(This is a merge of the parts of http://go/wvgerrit/105985 that affect
Android.)

This patch fixes some files that, after recent changes, were no longer
building when using OpenSSL instead of BoringSSL. <memory> was missing
in a header, and a function whose return type is different on OpenSSL
was tripping up the format-string warnings.

Bug: 168553979
Test: jenkins/ce_cdm_tests
Test: Android CDM Build
Change-Id: Id6a33d0ce0d3cbe5fe33b3f22aa3ee6b03ac76dd

libwvdrmengine/cdm/core/src/privacy_crypto_boringssl.cpp

@@ -336,11 +336,12 @@ bool ExtractExtensionValueFromCertificate(const std::string& cert,
   STACK_OF(X509)* certs = pkcs7->d.sign->cert;
 
   // Find the desired certificate from the stack.
-  if (cert_index >= static_cast<size_t>(sk_X509_num(certs))) {
+  const size_t num_certs = static_cast<size_t>(sk_X509_num(certs));
+  if (cert_index >= num_certs) {
     LOGE(
         "Unexpected number of certificates in chain: "
         "count = %zu, minimum = %zu",
-        sk_X509_num(certs), cert_index + 1);
+        num_certs, cert_index + 1);
     return false;
   }
 

libwvdrmengine/oemcrypto/ref/src/oemcrypto_usage_table_ref.h

@@ -9,6 +9,7 @@
 
 #include <stdint.h>
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>