Log Message:
Add patch that fixes
error: invalid lvalue in assignment
in editor/pnmaddnoise.c.

This was noticed on DragonFly with gcc 3.4.5.
Found idea from DarwinPorts.
Also tested on NetBSD 2.0.2 (gcc 3.3.3) and Linux (gcc 3.3.5).

I do not know if this is improved in netpbm upstream yet.

Okay'ed by maintainer.