[oe] Heads up: stricter package checking with newer opkg versions

[Koen Kooi]

Hi,

Opkg > r387 propagates all errors, so if your package is broken it might 
have installed before, but won't anymore.

Things like creating a symlink over an existing dir (e.g. udev 141 after 
another package installed a udev rule already) or creating a dir with 
the insufficient permissions and installing a file into it (adobe-fonts) 
now fail.

If building an image suddenly starts failing, have a look at the log and 
see what's wrong. Most likely the package is trying to do something 
wrong and we need to fix that.

I'm testing a fix for the udev symlink currently.

regards,

Koen