[gimp] Update NEWS about libpng

[Mukund Sivaraman <muks src gnome org>]

commit 9f7ad1cea0ff4e27647e0bcd2251639695def40d
Author: Mukund Sivaraman <muks banu com>
Date:   Thu May 12 08:44:30 2011 +0530

    Update NEWS about libpng

 NEWS |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 76290f0..e357109 100644
--- a/NEWS
+++ b/NEWS
@@ -50,7 +50,7 @@ Plug-ins:
  - Port screenshot from GdkPixbuf to cairo
  - Fix the annoying parser build warnings in imagemap
  - Add a check-for-deprecated-procedures-in-script-fu make target
- - PNG?
+ - Update libpng code to not use deprecated API (file-mng and file-png)
 
 Data: