MSI: If a source directory doesn't exist, use the install root instead.

[Mike McCormack]

This patch reverts the one titled "Make all source directories at the 
root of the install.", and hopefully fixes the problem properly.

It seems that if an msi source folder is resolved and is found to not 
exist on the source media, the root directory of the source is used.

Mike


ChangeLog:
If a source directory doesn't exist, use the install root instead.

  dlls/msi/helpers.c |  107 
++++++++++++++++++++++++++++++++++------------------
  1 files changed, 69 insertions(+), 38 deletions(-)

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