Remove non-POSIX rlimit resources, and as missing RLIMIT_AS.
Remove non-POSIX rlimit resources, and as missing RLIMIT_AS.

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