[arch-general] nitrogen libpng rebuild information

[pyther]

As nitrogen is currently orphaned I am sending this message here in 
hopes to avoid duplicate efforts.

Two issues:
-Nitrogen won't build against libpng 14
-Nitrogen crashes with "terminate called after throwing an instance of 
'Gdk::PixbufError'"

According to the developer: "It had a stray include of a libpng file 
that it hasnt needed in years that just sorta stayed there and recent 
libpng updates made that line problematic." He states that debian has a 
patch for this.

However, he also states: "That's been long fixed in git. You can clone 
master if you want and grab it, or wait a few days, 1.5 has been in rc 
for a few weeks and no complaints about it so far so i'll release it 
soon." He stated it can be as soon as today.

The crashes occur with both nitrogen 1.4.2 (from the extra repo) and git 
(soon to by 1.5). As I am writing this message, I am currently working 
with the developer to resolve this issue. He has given me a patch, which 
essential catches the error and prints some debug info to stderr. With 
this patch nitrogen git runs flawlessly. So I believe it is going to be 
a simple fix that should be hopefully be applied to git in the next few 
hours.

With this said, I suggest that we wait for nitrogen 1.5 to be released. 
Even if we were to patch 1.4.2 we would still have the issue of the 
gdk::PixbufError crashes.

~pyther