Update poclbm

The new version supports the stratum protocol.
Remove remove-default.binary hook

<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=682957> fixed in
live-build 3.0~a62-1.
config: remove --bootappend-live setting

'quiet' is the default these days, and including this flag broke the
build with the final live-build 3.0 (previously it appended to boot
flags, rather than replacing them).
live-miner-config chroot hook: don't use set -e

Hook scripts are sourced, and it was set by the sourcing script.
Typo
Build dkms module in a live-config hook script

The 1150-xserver-xorg hook script now automatically recognizes ATI
hardware and tries to load the fglrx kernel module; however previously
it didn't exist until the /etc/profile hook script built it. Instead,
build it before 1150-xserver-xorg runs.

Due to this change, we no longer need to set LIVE_XORG_DRIVER.
Make build failures easier to detect

If /usr/lib/live/build/binary_hdd fails to unmount the temporary VFAT
filesystem then the build halts, but 'lh build' did not exit with an
error. The use of the wildcard in the Makefile means that we did not
notice the lack of the output file binary.img.

Hardcode the list of expected output files for each build type, and fail
the build if they are missing.