08-06=09 sync with ksh93t api

07-09-17 move from dsslib/sh and get working with ksh93s+

07-05-09 update for lib_init(flags,context) context arg

07-03-19 update nv_setref() calls

04-02-29 fix bugs exposed by $(CC.EXPORT.DYNAMIC)

04-02-14 add ksh93:command prereq for -lshell

04-01-30 install as ksh plugin