Fix Symbol Visibility #72
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…with LTO/-fvisibility=hidden
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Explicitly marks API symbols with attribute((visibility("default")) on GNU compatible compilers. When building with -fvisibility=hidden, LTO, etc., each lib had its symbol hidden.
This ensures the shared libraries will respectively export luaopen_compat53_io, luaopen_compat53_string, luaopen_compat53_table, and luaopen_compat53_utf8.