Add getopt_long.
Add getopt_long.

rrthomas/luaposix,snegovick/luaposix,snegovick/luaposix,rrthomas/luaposix,zevv/luaposix,ardje/luaposix,zevv/luaposix,jimmyharris/luaposix,ardje/luaposix,luaposix/luaposix,jimmyharris/luaposix