Make Lua taps work in out-of-source-tree builds.

make-taps.pl needs to know where to find the source files otherwise none of
the tap data gets built correctly.

This makes the wslua test suite run in out-of-source-tree builds too.

Change-Id: I059474d90d59e87bd57dba18530a66a927a014cf
Reviewed-on: https://code.wireshark.org/review/3337
Reviewed-by: Evan Huus <eapache@gmail.com>
Make the nameres test suite work out of tree by looking for the global hosts
file in the build directory (rather than the source directory).

Change-Id: I365e573ee84e9a41aa76f4aa9a4a6efaf42fb60e
Reviewed-on: https://code.wireshark.org/review/3334
Reviewed-by: Evan Huus <eapache@gmail.com>