added curl_mvsnprintf to the export list; I appened to the end cause of the numbering ...

lib/libcurl.def

@@ -49,4 +49,5 @@ EXPORTS
 	curl_multi_strerror @ 41;
 	curl_share_strerror @ 42;
 	curl_easy_reset @ 43;
+	curl_mvsnprintf @ 44 ;