Update provided by Jonathan Buschmann in PR pkg/53787.
I added some pkgconfig invocations, because otherwise it was linking
to lua without the RPATH to liblua.
Added a test target.
Version 1.7.0 [15/Sep/2017]
symlinkattributes function now provides 'target' field, containing name of the file that the symlink points to.
attributes, symlinkattributes, touch, mkdir, and rmdir functions now return system-dependent error code as the third value on error.
Fixed detection of closed files for Lua 5.2+ in setmode, lock, and unlock functions.
Fixed various compiler warnings.
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