Force lua main.c to include luajit headers
Force lua main.c to include luajit headers

On my system, when both lua and luajit are installed, multiple headers
exist in /usr/include. However, my lua installation is 5.3, which has
some api-breaking changes, which means that the standard lua.h must not
be included.

Simply force lua.h to come from luajit-2.0 directory.

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