Fix vendoring of package using go mod vendor #80
Merged
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A directory with only C files will not be vendored by go mod vendor,
see this issue: golang/go#26366,
specifically, Russ Cox's response
golang/go#26366 (comment).
Because of this, when vendoring github.com/aarzilli/golua with go mod
vendor, the C header files under github.com/aarzilli/golua/lua/lua are
not vendored. This commits adds a workaround to this issue by adding
dummy Go files which makes go mod behave correctly. This workaround
was based on a similar one found here:
crawshaw/sqlite#88.