Merge branch 'js/no-curl-easy-strerror-on-old-curl'

Done to support compilation on __TANDEM, but is independently useful
for people with older version of libcURL.

* js/no-curl-easy-strerror-on-old-curl:
  http.c: don't use curl_easy_strerror prior to curl-7.12.0

http.c

@@ -806,10 +806,12 @@ static int http_request(const char *url, void *result, int target, int options)
 				ret = HTTP_REAUTH;
 			}
 		} else {
+#if LIBCURL_VERSION_NUM >= 0x070c00
 			if (!curl_errorstr[0])
 				strlcpy(curl_errorstr,
 					curl_easy_strerror(results.curl_result),
 					sizeof(curl_errorstr));
+#endif
 			ret = HTTP_ERROR;
 		}
 	} else {