msi/tests: Make tests pass for Windows Installer 3.0 [1/3]

[Ge van Geldorp]

Windows Installer 3.0 seems to check parameter consistency earlier,
causing it to return ERROR_INVALID_PARAMETER more often than later
versions. In particular, it doesn't like it when you pass a NULL buffer
but a non-zero size which is what we did in a lot of tests. Changed to
pass a buffer and then check that the buffer is not modified.

Changelog:
  msi/tests: Windows Installer 3.0 often returns ERROR_INVALID_PARAMETER
---
 dlls/msi/tests/install.c |   64 +++++++++++++--------
 dlls/msi/tests/source.c  |  147
++++++++++++++++++++++++++++++----------------
 2 files changed, 136 insertions(+), 75 deletions(-)




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