reg: Add reg.exe test suite. (try 2)

[Akihiro Sagawa]

Try 2:
  - Avoid memory allocation in run_reg_exe_ function.
  - Add more broken tests in WinXP.
  - Compare the exit code outside of run_reg_exe function.
  - Introduce REG_EXIT_SUCCESS/REG_EXIT_FAILURE constant and use it.

---
 configure.ac                   |   1 +
 programs/reg/tests/Makefile.in |   5 +
 programs/reg/tests/reg.c       | 263 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 269 insertions(+)
 create mode 100644 programs/reg/tests/Makefile.in
 create mode 100644 programs/reg/tests/reg.c

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