schannel: fix build error on targets <= XP

- Use CRYPT_STRING_HEX instead of CRYPT_STRING_HEXRAW since XP doesn't
  support the latter.

Ref: https://github.com/curl/curl/pull/2376#issuecomment-382153668

Closes https://github.com/curl/curl/pull/2504

diff --git a/lib/vtls/schannel.c b/lib/vtls/schannel.c
index 5387d8713ab056183bf58bca6439425675274962..190ecca23510989b3ae20bd525563c4419c40813 100644 (file)
--- a/lib/vtls/schannel.c
+++ b/lib/vtls/schannel.c
@@ -433,7 +433,7 @@ schannel_connect_step1(struct connectdata *conn, int sockindex)
       cert_thumbprint.cbData = CERT_THUMBPRINT_DATA_LEN;
 
       if(!CryptStringToBinary(cert_thumbprint_str, CERT_THUMBPRINT_STR_LEN,
-                              CRYPT_STRING_HEXRAW,
+                              CRYPT_STRING_HEX,
                               cert_thumbprint_data, &cert_thumbprint.cbData,
                               NULL, NULL)) {
         Curl_unicodefree(cert_path);