add option to install packages on recreating chroot

Kristian Klausenrequested to merge
github/fork/holymonson/packages into master

Created by: holymonson

For official repo, base-devel is an implicit makedepends. Howerver, when building other packages, i.e. pkgname-git, it needs git or svn. Or we may want distcc ahead for cross compilation.

Add an option to install packages on recreating chroot.

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