win32: Also report 64-Bit applications Win-x64

Up until now we did not report entries from the 64-Bit view of the
registry. This commit reports those entries and also deduplicates the
entries.

Change-Id: I99e08710257331f5dce36ca64653de6f88139592
Bug-Url: https://bugzilla.redhat.com/1105056
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>