Since ksh 93u+m comes bundled with libast 20111111, there's no need
to support older versions, so this is another cleanup opportunity.
src/cmd/ksh93/include/defs.h:
- Throw an #error if AST_VERSION is undefined or < 20111111.
(Note that _AST_VERSION is the same as AST_VERSION, but the
latter is newer and preferred; see src/lib/libast/features/api)
All other changed files:
- Remove legacy code for versions older than the currently used
versions, which are:
_AST_VERSION 20111111
ERROR_VERSION 20100309
GLOB_VERSION 20060717
OPT_VERSION 20070319
SFIO_VERSION 20090915
VMALLOC_VERSION 20110808
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