package/dnsmasq: do not select Lua, depend on it

Lua is a provider for the virtual package lua-interpreter, so it cannot
be selected, as explained in the manual.

Turn the 'select' into a 'depends on'.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>