- Port and readd memory leak patch to put_ifs() of sh/init.c
- Make sigexec more smart to help the pty helper binary to work as
  this helper is used in the test suite

- Update to 2012-02-29 of ksh93u+ for final version
  12-02-29 A bug which could lead to a core dump when more that four shared
	   libraries were added with the builtin command has been fixed.
  12-02-29 Fixed a few bugs which caused SIGCHLD to be blocked preventing
	   background jobs from being reaped until a foreground job was run.
  12-02-27 A bug in which sh -c for a simple command caused a fork() has been
	   fixed.
  12-02-27 A timing bug on systems such as AIX that doesn't support vfork()
	   that could cause the exist status to get lost has been fixed.
  12-02-22 A private file descriptor that was not close-on-exec for a command
	   substitution and has been fixed.
  pty:
  12-02-28 pty.c: change --verbose[=level] to --debug=level
  libast:
  12-03-10 misc/optget.c: HELP_index for "PLUGIN" too
  12-02-29 include/shcmd.h: PLUGIN_VERSION 20111111 for cdt disc/meth change
  12-02-29 comp/spawnveg.c: fix sigcritical() to include waitpid() for internal child
  12-02-29 malloc.c: make __malloc_hook initialization thread safe
  12-02-24 comp/iconv.c: fix winix UTF-8 vs UCS-2 over-conversion
  12-02-24 astsa/*.h: clean up header guards
  12-02-24 astsa/astsa.omk: clean up standalone old make makefile interactions
  12-02-21 misc/cmdarg.c: fix bug that set argv[0]
  libcoshell:
  12-02-22 coinit.c: handle non-identifier export var names
  libpp:
  12-02-29 pp.probe: handle predefined function-like macro definitions

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