loaders: ZIP: Fix errno vs err typo.

This fixes segfault on corrupted zip files.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
loaders: Experimental JPEG 2000 support.

Add experimental JPEG 2000 support using openjpeg library.

You need at least openjpeg 2.0.0, previous APIs are not usable
and even 2.0.0 doesn't seem to be finished...

But here it is, enjoy!

Signed-off-by: Cyril Hrubis <metan@ucw.cz>