subpackages: fix minor regression

Before subpackages, when running package there where 2 cases:
case 1: ${PACKAGES} directory exist:

packages are created in the work/pkg directory then copies into
${PACKAGES} directory

case 2: ${PACKAGES} does not exist:

packages where only created in work/pkg

After subpackages in the case 2, the packages get copied into the

directory actually running the make package comment.

This change makes the framework behave like before subpackages

Reported by: Antonio Huete Jimenez (tuxilio from Dragonfly irc

		channel)