msi: Use SysAllocString/SysFreeString for BSTR members of EXCEPINFO structure.

[Misha Koshelev]

Thanks to James for pointing out that the automation tests were failing when running with
WINEDEBUG=+relay. This led me to do some research and EXCEPINFO bstr fields get SysAllocString'ed
and then must be SysFreeString'ed, so also this fixes a memory leak in the automation tests too.
---
 dlls/msi/automation.c       |    4 ++--
 dlls/msi/script.c           |    6 ++++++
 dlls/msi/tests/automation.c |    4 ++++
 3 files changed, 12 insertions(+), 2 deletions(-)
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