[gupnp-dlna] Update TODO about exporting symbols.

[Jens Georg <jensgeorg src gnome org>]

commit d01bc65b635ae38aa62a12527121279bcbffb722
Author: Krzesimir Nowak <krnowak openismus com>
Date:   Mon Nov 19 10:05:38 2012 +0100

    Update TODO about exporting symbols.

 TODO |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/TODO b/TODO
index 7d76a8a..df272ee 100644
--- a/TODO
+++ b/TODO
@@ -22,4 +22,9 @@
 
 * Bring the tests back to life. And make them being run on make check.
 
+* Don't export all functions out there. There should be some linker
+  flag that either takes a regexp for functions to export or takes a
+  file listing them. Otherwise using G_GNUC_INTERNAL for every
+  function not to be exported will be tedious.
+
 * Read TODO.old for some ideas.