[crossfire] [PATCH] Fix for libpng compilation problem

[David McIlwraith]

Hi,

A missing png_setjmp() results in compilation failure in latest
subversion sources on ArchLinux (png_infop's jmp_buf is accessed
directly in one place). A proposed fix is attached.

Regards,
- David McIlwraith <2c93e8f1 at gmail.com>
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