This patch enhances the Unix shell simulation mode to support the UNIX
exit command.
On VMS, exit 1 is success and exit 0 is a failure.
With GNV$MAKE_UNIX_SIM enabled, exit 1 is now a failure and exit 0 is a
success.
Regards,
-John
>From 55638f37333c9b539312698d163df8de37d37421 Mon Sep 17 0
This patch is a complete rewrite of the VMS command parser.
In order to support the existing VMS recipe syntax which is a
combination of VMS and Posix shell syntax, VMS had to reparse the action
lines to simulate the Posix shell syntax.
The existing parsing code was making too many incorrect
