Adding comment explaining how to build this utility. Not part of the build.

config/asencode.cpp

@@ -36,6 +36,12 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+/*
+ * To compile, do:
+ *
+ *   gcc -framework ApplicationServices -l stdc++ -o asencode asencode.cpp
+ */
+
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>