Move the '--disable-bluez' and '--disable-iscsi' options to
PACKAGECONFIG. And added the ${BLUEZ} dependency.
Fix up the 'gcrypt' option to depend on 'libgcrypt' instead of gcrypt.
This is the expected dependency as noted in the QEMU configure help.
Handle the '--audio-drv-list' option inside the PACKAGECONFIG[alsa]
args. The previous setting uses a ',' to denote the options for the arg
however a space inside quotes is also acceptable and allows the arg to
be used into the PACKAGECONFIG flag.
