Add /dev directory which was erronously removed from Linux chroots.
Make pseudo random data inside chroot for platforms that lack it.
Disable parallel builds for deps, since not all of them support it.
Make MAKEFLAGS and LD_ALTEXEC inheritable in the chroot environment.
Put full path to make in MAKE variable.

Otherwise we risk that later assignments to the PATH variable changes
the version we use.
Disable checksum for LMDB tarball.

Since it is downloaded directly from the git tarball generator, its
checksum may change due to differing timestamps or internal file
order. But we are downloading a direct Git SHA, so we trust that the
contents are the same.
Merge pull request #8 from kacfengine/chroot_fixes

Chroot fixes
Base LMDB tarball checksum on content of each contained file.

Since it is downloaded directly from the git tarball generator, its
checksum may change due to differing timestamps or internal file
order. But the file content should be the same.
Merge pull request #10 from kacfengine/master

Base LMDB tarball checksum on content of each contained file.