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Also a bit more constification and cleared up the legacy sbbs_get_ini_fname()
usage: the hostname argument hadn't be used in a long, long time.

We only support platforms where slash is a legal path separator.

Needed for text.dat support in SBBSecho

load_cfg really should be made either a static library or an exported
function from libsbbs.so that everything reuses. Kind of silly to be
recompiling and linking these files with every app now.