msi: Resolve file source paths dynamically, as the source directory can be changed.

[James Hawkins]

---
 dlls/msi/action.c        |   31 +++++++----------------------
 dlls/msi/files.c         |   26 +++++++++++++++---------
 dlls/msi/helpers.c       |   48 +++++++++++++++++++++++++++++++++++++++++++++-
 dlls/msi/msipriv.h       |    3 +-
 dlls/msi/package.c       |    3 ++
 dlls/msi/tests/install.c |   43 ++++++++++++++++++++++++++++++++++++++++-
 6 files changed, 118 insertions(+), 36 deletions(-)
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