[cairo] Bug compiling cairo in AIX

[Chris Wilson]

Rajesh Narayanan (rajnaran_amb at hotmail.com) said: 
> Thanks for the response.  I did use #undef jmpbuf after png.h include and try to make again.
>  
> I got the same error:
> cairo-png.c: In function `png_simple_error_callback':cairo-png.c:97: error: structure has no member named `jmpbuf'make[2]: *** [cairo-png.lo] Error 1make[2]: Leaving directory `/vignette_temp/Wireshark_src/Dependent/cairo-1.4.10/src'make[1]: *** [all-recursive] Error 1make[1]: Leaving directory `/vignette_temp/Wireshark_src/Dependent/cairo-1.4.10'make: *** [all] Error 2
> and this is the function code:
> static voidpng_simple_error_callback (png_structp png_save_ptr,                           png_const_charp error_msg){    _cairo_error (CAIRO_STATUS_NO_MEMORY);    longjmp (png_save_ptr->jmpbuf, CAIRO_STATUS_NO_MEMORY);}
> Regards,
> Raj

Taking it one step further... Reading libpng, it appears that should the
custom error handler return then libpng will call it's default error
handler which in this case would trigger an abort. So it seems safe to
just remove the usage of ->jmpbuf. Patch attached.

Hope this helps.
--
Chris Wilson
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