Re: build fails with libpng 1.5.12

[Karl Berry]

    ./base/gdevpng.c: In function 'png_print_page':
    ./base/gdevpng.c:283:9: error: dereferencing pointer to incomplete type

Didier - any chance of a new GNU Ghostscript, in general?  The latest
Aladdin release is 9.06.  Perhaps it fixes the libpng stuff.

Brandon - perhaps there is some cpp symbol that can be defined so png
provides the old symbols.  (Fie on backward-incompatible changes,
anyway.  We went through plenty of pain in TeX dealing with it.)

Thanks,
Karl