makepkg: calculate exact total file size

The current calculation of the total file size for a package using "du"
suffers from issues in portability and correctness.  Especially on btrfs,
this can result in clearly wrong package information such as:

Download Size  : 14684.29 KiB
Installed Size : 7628.00 KiB

Use an approach based on "stat" to calculate total file size.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

0 files changed, 0 insertions, 0 deletions