fusion: Use parsed properties for assembly enumeration instead of trying to parse the display name again.

The display name passed in may not be normalized, e.g. if the version number
is passed as "1.0.0.00000" instead of "1.0.0.0". This patch should also cut
down on case insensitive file searches.

Office 2007 SP1 installer depends on this. I will supply a test as
soon as I figure out how to create a variation of the test assembly
in dlls/fusion/tests/asmcache.c.