instead of $HOME/bin, because on some systems `sudo` alters $PATH for
security reasons

Signed-off-by: Alejandro Mery <amery@geeks.cl>

so we can actually `sudo sde ....` later

Signed-off-by: Alejandro Mery <amery@geeks.cl>

The check will be run right after the postinstall hook and before
creating the flist.

Note:

New versions of `file` return "XZ compressed data" instead of
"xz compressed data" like former versions did, which breaks xz
file type detection in 'sde-download'.

This reverts commit 26e9d3bd7e.

Note:

Initially we added those packages to be able to be able to build GCC with the
Graphite loop optimizations.
Even when using the cloog-isl backend we still need ppl for building gcc!

Note:

Actually this implementation is only a slightly changed version of
the initramfs output support.