msi 4: Check the destination file's hash and skip that file if the hash matches

[James Hawkins]

Hi,

Changelog:
* Check the destination file's hash and skip that file if the hash matches.

 dlls/msi/action.c        |   37 +++++++++++++++++++++++++++++++++++++
 dlls/msi/files.c         |   22 ++++++++++++++++++++++
 dlls/msi/msipriv.h       |    1 +
 dlls/msi/tests/install.c |    5 +----
 4 files changed, 61 insertions(+), 4 deletions(-)

-- 
James Hawkins
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