Bug fix - the pkg-config wrapper should pass its exit code.

Some configure scripts check whether a package is present by running pkg-config and checking its exit code, so they assume non-existing dependencies are installed when pkg-config always exits with 0.
Bug fix - force SDL to build the correct drivers.
Worked around a segfault in alsa-lib.

alsa-lib causes wordfree() to segfault. Since this issue could not be reproduced on another distro, it's impossible to use a debugger to obtain a full backtrace of the crash and observe pointers.

In addition, alsa-lib won't work unless ipc_gid is an existing group.
Added support for the new package listing feature of packdude to gpackdude.