This fixes problem with preferences in feeds and removes patch required
to prevent such collision.

My patch, which was present in the hack folder, is no longer applying as
mariadb was updated in OpenWrt 18.06, 19.07 and master branches.
This patch was meant to be a workaround as something in OpenWrt was
changed and it caused inconsistency in the installation of packages and we
would like to have provided mariadb in our feed, this was the easiest
and a quicker solution at that time.

Solution is provided in this commit: a42ef21a740653ee76146bfccee1ab6afbd65539

Add directories and files generated byt generate_lists and
generate_medkit.

The default value of output_path should have been set after arguments
parsing as empty variable is used to detect if variable was provided or
not.

Also change help as OUTPUT_PATH is optional and there is default in
place if not provided.

This was missed in previous commit cd222783

The empty `space` variable in Makefile for hostapd was causing that
invalid Kconfig was generated and configuration phase failed.

This is happening only with latest GNUMake.

This can be shared between multiple scripts so move it to centralized
file.

libubox introduced new function that is now missing for ucert.

Downgrading ucert is not ideal because it contains security fix.

The real problem might be in procd and update of libubox just exposes
that. There is newer version of procd.

Next year...

It seems that setting quirks on our platform results to timeout issues
when using SD card. It was working fine before quirks were introduced so
let's revert them just for now.