Revert r310507 by putting pkg-plist back. The problem is that w/o pkg-plist
file installation of this ports hangs on "Generating temporary packing list"
stage. I discovered that while testing of libtorrent-rasterbar-16-python update
on a live system (while build is fine in tinderbox tests). I found exactly the
same report at [1] while googling of the problem.
Sorry about that.

[1] http://forums.freebsd.org/showthread.php?t=37177

Pointyhat to: rm (myself)