to put png.h and pngconf.h in $prefix/include, like the other scripts,
instead of in $prefix/include/libpng.  Also revised makefile.sco
to put them in $prefix/include/libpng12 instead of in
$prefix/include/libpng/libpng12.

and added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.

It is a pointer, not an exported function.

and moved it from libpngpf.3 to libpng.3 since it is exported.

and png_set_longjmp_fn() to libpngpf.3 synopsis

into scripts/README.txt and updated the copyright year in scripts/pngwin.rc
from 2006 to 2009.

and removed the deprecated png_check_sig() function.