build.sh: improve build_all_pkg.sh fix warning [1/1]

PD#SWPL-67525

Problem:
improve build_all_pkg.sh

Solution:
improve build_all_pkg.sh

Verify:
ad401_a113l

Signed-off-by: shijie.xiong <shijie.xiong@amlogic.com>
Change-Id: I2f9bebbef4db085ba9c52347fafc27bb9f27e276
2 files changed