1.6.0: use libcurl version macro that works on older platforms

Signed-off-by: Hans Zandbelt <[email protected]>

Author: zandbelt

ChangeLog

@@ -1,5 +1,6 @@
 12/06/2023
 - add support for the OAuth 2.0 Client Credentials grant type
+- use libcurl version macro that works on older platforms
 - release 1.6.0
 
 11/08/2023

src/http.c

@@ -1007,7 +1007,7 @@ bool oauth2_http_call(oauth2_log_t *log, const char *url, const char *data,
 	curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&buf);
 
 #ifndef LIBCURL_NO_CURLPROTO
-#if CURL_AT_LEAST_VERSION(7, 85, 0)
+#if LIBCURL_VERSION_NUM >= 0x075500
 	curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS_STR, "http,https");
 	curl_easy_setopt(curl, CURLOPT_PROTOCOLS_STR, "http,https");
 #else