Avoid using empty initializer lists.

One of Chromium's toolchains can't handle this for some reason. See also
empty_crls and empty in TestVerify.

Change-Id: I5e6a849f3042288da2e406882ae5cfec249a86ae
Reviewed-on: https://boringssl-review.googlesource.com/11340
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

crypto/x509/x509_test.cc

@@ -545,7 +545,8 @@ static bool TestCRL() {
     return false;
   }
 
-  if (Verify(leaf.get(), {root.get()}, {root.get()}, {},
+  std::vector<X509_CRL *> empty_crls;
+  if (Verify(leaf.get(), {root.get()}, {root.get()}, empty_crls,
              X509_V_FLAG_CRL_CHECK) != X509_V_ERR_UNABLE_TO_GET_CRL) {
     fprintf(stderr, "CRLs were not required.\n");
     return false;