wininet: Support the lpszFileExtension "reserved" parameter being passed into CommitUrlCacheEntryA.

[Robert Shearman]

Store it in the URL cache entry and allow it to be retrieved by 
RetrieveUrlCacheEntryFile and other functions.
---
  dlls/wininet/tests/urlcache.c |    3 +-
  dlls/wininet/urlcache.c       |  132 
++++++++++++++++++++++++++---------------
  2 files changed, 87 insertions(+), 48 deletions(-)
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