Since the LEDE nslookup applet is already specific to LEDE, move the
libresolv detection into the busybox Makefile that LEDE uses.
This fixes builds with external toolchains that don't automatically
search for headers and/or libraries without being told so.
Fixes: de5b8e5d2f ("busybox: add musl compatible nslookup replacement")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Add an alternative nslookup applet implementation which is compatible with
musl libc wrt. name server selection and which supports a number of additional
features such as query type selection.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>