secur32: Replace sprintf with snprintf to avoid deprecation warnings on macOS.

dlls/secur32/schannel_gnutls.c

@@ -401,7 +401,7 @@ static void check_supported_protocols(
 
     for(i = 0; i < num_flags; i++)
     {
-        sprintf(priority, "NORMAL:-%s", flags[i].gnutls_flag);
+        snprintf(priority, sizeof(priority), "NORMAL:-%s", flags[i].gnutls_flag);
         err = pgnutls_priority_set_direct(session, priority, NULL);
         if (err == GNUTLS_E_SUCCESS)
         {
@@ -1022,7 +1022,7 @@ static NTSTATUS schan_get_cipher_info( void *args )
     wcscat( info->szCipherSuite, widthW );
     wcscat( info->szCipherSuite, info->szCipher );
     wcscat( info->szCipherSuite, underscoreW );
-    len = sprintf( buf, "%u", (unsigned int)info->dwCipherLen ) + 1;
+    len = snprintf( buf, sizeof(buf), "%u", (unsigned int)info->dwCipherLen ) + 1;
     ptr = info->szCipherSuite + wcslen( info->szCipherSuite );
     ntdll_umbstowcs( buf, len, ptr, len );
     wcscat( info->szCipherSuite, underscoreW );