Get compatible with OpenWrt ImageBuilder

[ilario]

Following the discussion from #794 (comment)

Advantages would be many.
For example, being able to compile LibreMesh images through https://firmware-selector.openwrt.org/ or allowing the community to compile images without needing the full BuildRoot and without the need to create and host our own ImageBuilder.

Related issues:
#794 (and #999 would help also for this issue)
#800 (and #991 is specifically written for this issue)

Some problematic code:

lime-packages/packages/lime-debug/Makefile

Lines 38 to 42 in 39a57a7

	define Package/$(PKG_NAME)/config
	select BUSYBOX_CUSTOM
	select BUSYBOX_CONFIG_NC
	select BUSYBOX_CONFIG_NC_SERVER
	endef

[ilario]

Likely, also the dependency from dnsmasq-dhcpv6 is going to be problematic, as it conflicts with the dnsmasq package which is included by default.

lime-packages/packages/lime-proto-anygw/Makefile

Line 24 in 8aa007e

DEPENDS:=+ebtables-nft +dnsmasq-dhcpv6 +kmod-nft-bridge +libuci-lua \

For example, when compiling with both packages selected, errors such this appear:

 * check_data_file_clashes: Package dnsmasq-dhcpv6 wants to install file openwrt/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/root-ipq40xx/etc/hotplug.d/ntp/25-dnsmasqsec
	But that file is already provided by package  * dnsmasq

[ilario]

Likely, also the dependency from dnsmasq-dhcpv6 is going to be problematic, as it conflicts with the dnsmasq package which is included by default.

The solution has to be: using dnsmasq for IPv4 and odhcpd-ipv6only for IPv6. See #294

[ilario]

We should also get rid of the @(PACKAGE_iw||PACKAGE_iw-full) in the Makefiles of prometheus-node-exporter-lua-location-latlon, prometheus-node-exporter-lua-wifi-params, prometheus-node-exporter-lua-wifi-stations-extra and prometheus-node-exporter-lua-wifi-survey. But these packages are not suggested on the website, so it is not important.

[ilario]

An important step forward has been made in #1015.

The created x86 images does not yet boot on qemu (reported by @a-gave ) and the other images are yet to be tested.