Fix build issue with Lua >= 5.3
Fix build issue with Lua >= 5.3

bjh7242/ModSecurity,csanders-git/ModSecurity,bjh7242/ModSecurity,csanders-git/ModSecurity,csanders-git/ModSecurity,p0pr0ck5/ModSecurity,marcstern/ModSecurity,p0pr0ck5/ModSecurity,bjh7242/ModSecurity,marcstern/ModSecurity,csanders-git/ModSecurity,irtnog/ModSecurity,p0pr0ck5/ModSecurity,irtnog/ModSecurity,marcstern/ModSecurity,irtnog/ModSecurity,irtnog/ModSecurity,p0pr0ck5/ModSecurity,phpModSecurity/ModSecurity,bjh7242/ModSecurity,csanders-git/ModSecurity,csanders-git/ModSecurity,bjh7242/ModSecurity,irtnog/ModSecurity,marcstern/ModSecurity,marcstern/ModSecurity,bjh7242/ModSecurity,irtnog/ModSecurity,p0pr0ck5/ModSecurity,p0pr0ck5/ModSecurity