Add testcase for BZ 231357.
To do that a small enhancement to vg_regtest was needed:
(1) New declaration to allow specifying an environemnt variable
    that is set prior to invoking valgrind.
    eg:    env:  VAR=VAL
    There can be more than one such declaration
(2) prog-asis:  program_name
    This is like prog: except the program name is not prefixed with
    the testdir.

git-svn-id: svn:// a5019735-40e9-0310-863c-91ae7b9d1cf9
5 files changed