Don't call missing API function.

dlls/crypt32/tests/cert.c

@@ -1469,6 +1469,7 @@ static void testVerifyCertSig(HCRYPTPROV csp, const CRYPT_DATA_BLOB *toBeSigned,
     DWORD size = 0;
     BOOL ret;
 
+    if(pCryptVerifyCertificateSignatureEx) {
         ret = pCryptVerifyCertificateSignatureEx(0, 0, 0, NULL, 0, NULL, 0, NULL);
         ok(!ret && GetLastError() == HRESULT_FROM_WIN32(ERROR_INVALID_PARAMETER),
          "Expected HRESULT_FROM_WIN32(ERROR_INVALID_PARAMETER), got %08lx\n",
@@ -1486,6 +1487,7 @@ static void testVerifyCertSig(HCRYPTPROV csp, const CRYPT_DATA_BLOB *toBeSigned,
         ret = pCryptVerifyCertificateSignatureEx(csp, X509_ASN_ENCODING,
          CRYPT_VERIFY_CERT_SIGN_SUBJECT_BLOB, NULL, 0, NULL, 0, NULL);
          */
+    }
     info.ToBeSigned.cbData = toBeSigned->cbData;
     info.ToBeSigned.pbData = toBeSigned->pbData;
     info.SignatureAlgorithm.pszObjId = (LPSTR)sigOID;
@@ -1501,6 +1503,7 @@ static void testVerifyCertSig(HCRYPTPROV csp, const CRYPT_DATA_BLOB *toBeSigned,
         CRYPT_DATA_BLOB certBlob = { 0, NULL };
         PCERT_PUBLIC_KEY_INFO pubKeyInfo = NULL;
 
+        if(pCryptVerifyCertificateSignatureEx) {
             ret = pCryptVerifyCertificateSignatureEx(csp, X509_ASN_ENCODING,
              CRYPT_VERIFY_CERT_SIGN_SUBJECT_BLOB, &certBlob, 0, NULL, 0, NULL);
             ok(!ret && GetLastError() == CRYPT_E_ASN1_EOD,
@@ -1531,6 +1534,7 @@ static void testVerifyCertSig(HCRYPTPROV csp, const CRYPT_DATA_BLOB *toBeSigned,
              CRYPT_VERIFY_CERT_SIGN_SUBJECT_BLOB, &certBlob,
              CRYPT_VERIFY_CERT_SIGN_ISSUER_PUBKEY, NULL, 0, NULL);
              */
+        }
         CryptExportPublicKeyInfoEx(csp, AT_SIGNATURE, X509_ASN_ENCODING,
          (LPSTR)sigOID, 0, NULL, NULL, &size);
         pubKeyInfo = HeapAlloc(GetProcessHeap(), 0, size);
@@ -1539,7 +1543,7 @@ static void testVerifyCertSig(HCRYPTPROV csp, const CRYPT_DATA_BLOB *toBeSigned,
             ret = CryptExportPublicKeyInfoEx(csp, AT_SIGNATURE,
              X509_ASN_ENCODING, (LPSTR)sigOID, 0, NULL, pubKeyInfo, &size);
             ok(ret, "CryptExportKey failed: %08lx\n", GetLastError());
-            if (ret)
+            if (ret && pCryptVerifyCertificateSignatureEx)
             {
                 ret = pCryptVerifyCertificateSignatureEx(csp, X509_ASN_ENCODING,
                  CRYPT_VERIFY_CERT_SIGN_SUBJECT_BLOB, &certBlob,