- out-of-tree luajit-launcher build: no leftovers after `make clean`
- use the luajit library compiled by base: no point wasting time
building a second (different, possibly incompatible) version
- forward unknown make targets to base
- add `cmake` and `staging` directories to ignored output artifacts
- drop `package.path` and `package.cpath` luarocks specific entries
If the Android NDK and/or SDK are not setup, `kodev` will try to invoke
the `android-ndk` and/or `android-sdk` make targets. This can't be done
with `TARGET=android`, as `base/Makefile.defs` will error out trying to
call the (missing) compiler to get the target machine. Those rules need
to be available to all targets.
