https.c example: remember to call curl_global_init()

... in order not to leak memory on initializing an SSL library.

Reported by: Tomas Mlcoch

docs/examples/https.c

@@ -27,6 +27,8 @@ int main(void)
   CURL *curl;
   CURLcode res;
 
+  curl_global_init(CURL_GLOBAL_DEFAULT);
+
   curl = curl_easy_init();
   if(curl) {
     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
@@ -65,5 +67,8 @@ int main(void)
     /* always cleanup */
     curl_easy_cleanup(curl);
   }
+
+  curl_global_cleanup();
+
   return 0;
 }