make sure all checking macros define to 0 if not defined
make sure to vet use of `fsopen` on Windows since it it may or may not lock: use non-locking security version by default if possible
macro checks now used defined() plus an is-truth check to see if its valid
fix void return for declaration but int return for definition of luaL_loadbufferx and luaL_loadfilex
update macro style to be similar to the rest of the library
fix comment styling
