Revert "Maybe AIX requires LIBRUBYARG_SHARED?"
Revert "Maybe AIX requires LIBRUBYARG_SHARED?"

This reverts commit 65b29eb2d826d22ea5e628844d3a54ada9833f3c.

ruby/rubyspec,eregon/rubyspec,ruby/spec,ruby/spec,nobu/rubyspec,eregon/rubyspec,ruby/rubyspec,nobu/rubyspec,kachick/rubyspec,nobu/rubyspec,kachick/rubyspec,sgarciac/spec,ruby/spec,sgarciac/spec,sgarciac/spec,kachick/rubyspec,eregon/rubyspec