shell32: Return NULL-terminated list of arguments in CommandLineToArgvW.

[Sebastian Lackner]

Tests on the wine testbot indicate that on Windows Vista and greater the
list of arguments is NULL terminated.

Fixes http://bugs.winehq.org/show_bug.cgi?id=22829

---
 dlls/shell32/shell32_main.c  |   15 +++++++++------
 dlls/shell32/tests/shlexec.c |    4 ++++
 2 files changed, 13 insertions(+), 6 deletions(-)
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