and libpng-pc.in

    directory, to libpng-config.in and libpng-pc.in, respectively, and
    modified Makefile.am and configure.ac accordingly.  Now "configure"
    needs nothing from the "scripts" directory.
  Also, avoid redefining PNG_CONST in pngconf.h

Also netware.txt

(ported from the "master" branch)

(evidently the same change made in libpng-1.0beta54 was lost).

and removed the deprecated png_check_sig() function.

    so that only PNG_EXPORT functions are exported.