Add libpng 1.6.6.

libs/lpng166/ANNOUNCE

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+
+Libpng 1.6.6 - September 16, 2013
+
+This is a public release of libpng, intended for use in production codes.
+
+Files available for download:
+
+Source files with LF line endings (for Unix/Linux) and with a
+"configure" script
+
+   libpng-1.6.6.tar.xz (LZMA-compressed, recommended)
+   libpng-1.6.6.tar.gz
+
+Source files with CRLF line endings (for Windows), without the
+"configure" script
+
+   lpng166.7z  (LZMA-compressed, recommended)
+   lpng166.zip
+
+Other information:
+
+   libpng-1.6.6-README.txt
+   libpng-1.6.6-LICENSE.txt
+   Gnupg/*.asc (PGP armored detached signatures)
+
+Changes since the last public release (1.6.5):
+
+  Removed two stray lines of code from arm/arm_init.c, again.
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe)
+or to glennrp at users.sourceforge.net
+
+Glenn R-P