Add the other libpng stuff.

We can remove and strip each on a case by case basis.

MAC OS X builds now. Time to get the others.

extern/libpng/include/libpngpf.3

@@ -0,0 +1,30 @@
+.TH LIBPNGPF 3 "March 31, 2011"
+.SH NAME
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.2
+(private functions)
+.SH SYNOPSIS
+\fB#include \fI"pngpriv.h"
+
+\fI\fB
+
+\fBAs of libpng version \fP\fI1.5.1\fP\fB, this section is no longer \fP\fImaintained\fP\fB, now \fIthat
+
+\fBthe private function prototypes are hidden in pngpriv.h and not \fIaccessible
+
+\fBto applications. Look in pngpriv.h for the prototypes and a short \fIdescription
+
+\fBof each \fIfunction.
+
+\fI\fB
+
+.SH DESCRIPTION
+The functions previously listed here are  used privately by libpng
+and are not recommended for use by applications.  They are
+not "exported" to applications using shared libraries.  They
+are listed alphabetically here as an aid to libpng maintainers.
+See pngpriv.h for more information on these functions.
+
+.SH SEE ALSO
+.BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
+.SH AUTHOR
+Glenn Randers-Pehrson