urlmon: Implement URLDownloadToCacheFile

[James Hawkins]

Hi,

The Ability Office 4 installer uses URLDownloadToCacheFile to download
the msi file before running some tests, then calling
MsiInstallProduct.  This gets the installer to the next step.

Changelog:
* Implement URLDownloadToCacheFile.

 dlls/urlmon/umon.c |   50 +++++++++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 47 insertions(+), 3 deletions(-)

--
James Hawkins
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