be_package: Build the file list from MTREE if possible

This greatly speeds up file list generation times by avoiding
uncompressing the whole package.

pacman -S base with a deliberate file conflict:
before: 9.1 seconds
after:  2.2 seconds

Signed-off-by: Florian Pritz <bluewind@xinu.at>

0 files changed, 0 insertions, 0 deletions