newick-utils 1.6: Fix for LUA 5.2
newick-utils 1.6: Fix for LUA 5.2

Fix error: use of undeclared identifier 'LUA_GLOBALSINDEX'

Closes #1668.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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